Home HVAC Cools Some Rooms but Not Others

“My master bedroom has always been a little warmer than the rest of the house, but could it be because of the vents next to each other? submitted by /u/TalentManager1 [link] [comments]”

“The hvac works fine in the entire house except the bedroom, it blows air but barely any. In the winter it’s too cold and in the summer it’s too hot to even use the room. I’ve tried looking for a damper and wasn’t able to find one so I’m unsure. I’ve attached images so you can take a look, if you need anymore pictures of anything else please let me know and help me out😂 the duct is 36 ft long. I’ve thought about removing it and putting one closer, I could do that if I needed to but I was wonderi”

“I discovered this enormous gap in a supply hvac vent. This is within 2 yards of the furnace , so should have some of the hottest air leaching back out into my basement. We have always noticed that the basement is much hotter than upstairs in the winter when heat is on; and much colder than upstairs in the summer when AC is on. That’s why I started a resealing and insulation project and this is the first stark finding. Is this something I can use insulated pipe wrap effectively or do I need to re”

“My living room pumps extremely cold strong air but the two rooms that have this split and smaller tubes is so weak but I don’t sense any big leak when I check it. It looks like somebody before I bought the house just split the lines but did a bad job? Any advice would be great because every time I speak to HVAC companies before they even see my attic they imply we need to redo the entire thing. We just for a new ac unit so I’m not trying to spend thousands of dollars if I fix it myself if anyone”

“I had a new HVAC unit installed in my 850 sq ft. 1b, 1ba condo. The unit has three vents pushing heat into the living room/ dining room/ kitchen area with one return vent at the back end of the furnace. It has 1 vent pushing heat into the bathroom, and two vents pushing heat into the bedroom. Neither has a return vent. The bedroom stays 10 degrees cooler than the rest of the unit. I had the HVAC company come out and tell me what they thought I should do. The response was that I had three options”

“Hello, I am curious if this is something I could take on with basically no experience I knew my return was setup in some stupid way that it just opens under the stairs so I went to look at that to see how easy it would be to block it off. I decided to look at the duct as well and saw it is dangling into the crawl space. Seems they just used some foil tape to secure it before is that something I can just do again but properly? It seems they failed or this fix doesn’t work. Question 1: would i be”

“Htx. Two story house 2022, moldy supply vents. Hello I need help understanding my venting system. In all upstairs bedrooms, we have the vents pictured with the same covers. The supply vents pump cold air into the rooms and are all by the windows of the rooms. The other vents are always dusty but we feel nothing coming out and are all by the doors of the rooms. Are those vents return vents? The other clearly identified return vents in the house also get dusty so I am assuming these in the room ar”

“I'm redrywalling my basement and want to know if I should redo these ducts. They are just sheets nailed to one side of the studs. The other side is just drywall, no metal sheets. There are wall vents on the other side of the wall near the floor, and these also lead to the upstairs. The electrical runs thru the ducts, with caulk & tape to seal the holes in the studs. The wires run through both the in & out flows of the ac unit. I'm going to be redoing the electrical. Should I redo”

“I’ve had some HVAC work done during my renovation. They installed the return air duct before a wall was up being sure to give enough space. Now the wall is up and there is a lot of dead space in the ceiling. I’m hoping I could slide the duct closer to the wall so there was less wasted headroom in my basement. What level of difficulty would this be? submitted by /u/GhostD06 [link] [comments]”

“Could someone provide some advice as the best way to move stale air from a dead zone in an apartment? Split plan, AC on secondary bedroom side with return...cools secondary bedroom, bath, living room and kitchen. Dead zone is dining room short hallway and master bedroom and bath. I have tired so many ways of positioning fans to get the air to move with no luck! Really needs second return vent but its an apartment so basically we gotta figure it out. Send Help! submitted by /u/Wise-Im”

“HVAC company came to re-seal metal to metal the flex lines to the main trunk and now all the returns are blowing cold air. Reason I just noticed is because I finally put the covers on because they also sealed the boots the drywall from inside. HELP submitted by /u/LogKindly8154 [link] [comments]”

“I just had a new high efficiency natural gas ac+furnace installed. Its an old house, super small (800sq ft+ basement) and there is only one return air vent (6x10) in our room. Our room also only has one normal vent so it’s usually the warmest room in the house. It is also pretty loud in our room from the return air vent. Our basement stays significantly colder than the rest of the house in the summer when the AC is running. Can I just add a vent to the return air duct in the basement to cycle th”

“I just moved into a new place and the air conditioner unit had metal tape around it, but there was lots of holes so I called the Landlord and they said they had the HVAC person out to look at everything and fix that. The tape seems like they put one strip in one spot and there’s other spots still blowing out cold air. But then today I noticed that this bent is blowing out a lot of cold air. It’s a vent in the ceiling and it looks like it had tape over it at one point this is about 17 feet away f”

“Hi reddit, I am in central texas, and the average temperature outside is somewherr just shy of "surface of the sun". The office in my house is consistently 10-15 degrees hotter than the rest of it, and I am positive it is from a combination of having the highest (and vaulted ) ceiling in the house, being the furthest from the air handler in the attic, and having two gaming PC's outputting roughly 1,100 watts of heat between the two. It has one supply duct running to it (10" fl”

“All of my HVAC air ducts are installed like this, where the spring pulls the damper shut against the damper frame, and little to no air can come through. When I push the flaps in, air comes rushing out when the AC is on, but it obviously is pulled shut by the spring, unless I were to somehow bind the two flaps open. The few air ducts that actually blow air out of them have these dampers that are pinched and bound open. Is it really possible that all of these are installed backwards? If these wer”

“My house is a two story 3500 sq ft house in the Seattle area. It’s about 2000 sq ft on the first floor and 1500 on the second. The crawl space has a lot of flex duct which doesn’t seem to be leaking but it has some severe bends from where it hangs from the floor. It’s not supported very well and droops fairly often. There are no ducts in the attic space. The second floor has only floor registers. I had some rodent issues in the past but I haven’t seen any chewed through flex ducts. I can see whe”

“I have louvred doors for my HVAC closet (inside is a gas furnace & central a/c combo & a gas hot water heater). I know these specific doors provide ventilation for the closet. But I also have a rectangular hole in the ceiling, similar to the one in this picture: https://www.reddit.com/media?url=https%3A%2F%2Fpreview.redd.it%2Fhole-in-ceiling-of-hvac-closet-in-florida-v0-xy87h2ocvnwg1.jpeg%3Fwidth%3D640%26crop%3Dsmart%26auto%3Dwebp%26s%3D709ebfba6ac8b4cbd538f500aa6cc30f2c4b8fec What is th”

“Two rooms in my house cool like shit compared to the rest of the house which I had attributed it to the sun hitting that side of the house but I got up into the roof and I noticed that there doesn’t seem to be an actual split of the ducting? It looks like two 8 inch runs shoved and taped into a 10 inch flex duct. Is this normal? Should I get an actual split and replace that? Is it worth the effort? submitted by /u/MagicSilver [link] [comments]”

“Unit is directly under this vent. How difficult/expensive would it be to relocate this to the wall? How much will it impact the HVAC with 2 right angles instead of a straight shot? The house is small (800 sq ft) and this is in the main walkway of the house. As a result a lot of crap gets collected in this vent and moving to the wall would look way better and clean up easier. Will it be noticeably louder? In such a small house we already have to turn the volume up in the tv when it kicks in, vent”

“So just realized that my furnace intake has a duct(the one wrapped in black) that is connected to the outside of my house. I put a piece of paper and it's pulling air from it. My house is from the 2000's and not airtight at all. So wondering why would it be like this. Can I just disconnect this intake? Makes no sense to be pulling extremely hot or cold air from the outside. This is an 80% furnace, and I live in Michigan. submitted by /u/Zealousideal-Club903 [link] [comm”

“Previous owners moved/removed a wall, which forced them to remove the original supply duct to the floor vent in this room. They then had this monstrosity built to weave in and out of the existing shelves. The airflow obviously isn't great. How would you improve this before moving someone into the room? https://imgur.com/a/9ROH3CS https://imgur.com/a/ATERw6l submitted by /u/Conical [link] [comments]”

“I have 2 air return vents to use in our bedroom, which one would be better for cooling down the room, meaning pulling in more warm air from the room? submitted by /u/Budget-Concept-2258 [link] [comments]”

“What can I do to improve the airflow here? submitted by /u/Weekly_Bison_2881 [link] [comments]”

“I have a question about this ductwork. I feel like this got put together wrong. The top duct is my main run feeding all my upstairs rooms and the bottom two feed a bathroom and the master bedroom. The air flow to the master and bathroom is crazy but the other rooms get some flow but not enough to effectively cool them during the summer. How can I effectively balance the cfm here so the other rooms can cool down and the master is not freezing? submitted by /u/Pollux37 [link] [co”

“Recently had new HVAC ducting installed. This section is labelled "HOT," and I wonder if there is any reason I should not insulate it with the same insulation blankets used for water heaters? This is in my garage, so I see no reason to lose heat into the garage this winter, but I don't want to cover the vents with insulation blankets if it will damage the system in some way. submitted by /u/angelpjela1 [link] [comments]”

“Homeowner states vents in master bed are not blowing as hard as they used to, we believe the issue is the air is being trapped in the handler because the plenum has very little room so it is not fully escaping. You can see we dont have much room for the plenum it is only about 4 inches of space. Anyone have a idea how we can make this work submitted by /u/jaxmoe69 [link] [comments]”

“My bedroom gets considerably warmer than living room/my roommates bedroom. Even with blackout curtains closed. One vent blows considerably less cool air out so I stuck my phone up and took a picture and saw this?? submitted by /u/Beautiful_Guitar3380 [link] [comments]”

This duct here runs to a vent in the living room, however it’s in the worst place and covered by a couch so I don’t mind tapping in here. Just looking to…

“Hello all. Need some advice on how to install an ac vent in my upstairs hallway. Thinking about a 6x6 vent where the red square is. That hallway is a hotspot pretty much no air circulation in that area and also happens to be where the thermostat is so it’s always reading hot. My questions are how can I go about doing this? What’s the recommended vent diameter and all that fun stuff. Thank you in advance for any assistance and guidance. submitted by /u/antknee25 [link] [comments”

“I’m trying to improve airflow to the opposite side of my house, which has always had noticeably weaker airflow than the side closer to the current air handler. The current setup is basically: Current air handler → 16” round duct → old air handler box → reducer/transition → rectangular trunk (16” duct pictured left, box center, and reducer on right) The old air handler is no longer being used as an air handler. It’s basically just sitting in the duct path as a large box/plenum between the current”

“Hi, called my HVAC company but haven't heard back, and my contractor cannot supply the info. Hope you can advise. My owner-built house is flat roof, and my ceiling is the plywood deck sheathing. Nice interior beams hold the roof up. There is minimal insulation on the roof. Climate zone 4A. We are doing a gut reno of about ¼ of the upstairs so it's a good opportunity to try to improve things without making them worse. HVAC duct work for return and chimney have always been boxed in next to”

“Just moved into a 450 studio apartment in NYC where we plan to split off a tiny little bedroom from the main living area. The entire space is currently served by an ancient single large fan coil unit (~60 inches long). We are considering two possible options for its replacement: 1) two new smaller units, with one to be designated for the bedroom and 2) a new unit of the same size, but with a wall through fan vent in the bedroom wall to circulate cold and hot air. The second option is not only ch”

“I have this floor vent with a bed over it. We have no AC, just heat. I want to close the vent. So the bed can go over it whole. Is there danger/drawback to doing this? It'll be the only vent closed. submitted by /u/Rethirded [link] [comments]”

“Both of these ducts simply go into my attic. Wide open. The room has my gas water heater and furnace. It is off of my hallways and is a 5x7 foot room that I have a refrigerator in as well. My problem, it is HOT in there in the summer. So hot, the solid wood door swells and sticks in the summer. I’d say it gets to 90-95 in there easily. My question, why? I assume for venting in the case of a gas leak. My solution: go into the attic and pipe them to the outside of my house through the side of it.”

“Question for those that know more than I do: If insulating ducts actually cools and lowers the duct temperature, wouldn’t that make sweating and condensation worse? Wouldn’t it be better to seal air leaks instead? submitted by /u/bluewizard8877 [link] [comments]”

“My room doesn't have any ac or floor vents in it so I was planning on finding an extender to connect my room to the room next to me but I can only go through the wall and the other room still needs ac is there a 2 way floor vent extender or am I just out of luck submitted by /u/Square-Charity-5085 [link] [comments]”

“There used to be a wall that I removed that had a long grate that covered the length of both holes. I am assuming one is a heat/cold run and the other is a cold air return since I have seen none in the house… can anyone confirm that? It’s a heating and cooling system central air. Or any other info would be greatly appreciated! submitted by /u/Suspicious-Cow-5452 [link] [comments]”

“I'm going to put a passthrough vent in my master bedroom to help with the flow in there but I had a question. Does the location matter, or just that a vent exists to an exterior space, within the house of course, once the door is closed? I could defintely add a pass through vent in one of the corners of the room, or above the door, however, the opposite wall in those cases is shared with our living room. However, our master closet shares a room with laundry room so the vent would be out of e”

“The unit in my apartment has been kind of weak. I opened the closet and see this little gap where cold air blows out. Can I seal it with tape? submitted by /u/lildankkboi [link] [comments]”

“We recently had a leak in one of our bathrooms that got bad enough for the ceiling paint to start blistering. The leak was near the return air vent, so I assumed it was related to the HVAC system and called someone out to take a look. The first HVAC tech told me the primary condensate drain connection was broken at the drain pan. His recommendation was to replace the entire system. He quoted me $17,500 for a new heat pump and air handler. The other option was around $10,000 for a new coil and co”

“https://preview.redd.it/7kdoxo7yvcjh1.png?width=1191&format=png&auto=webp&s=11e483712ca462cb1102e327e49546b13cbc6e02 Hello, I'm a homeowner, and I have very little air flow in two rooms compared to other rooms in a new install. Attic Install: I have a 10" Flex duct (~22ft) feeding a wedge shaped small plenum (See Diagram. 24" x 18" x 0 to 10" Depth). The output of the small plenum are two 7" flex ducts feeding the top floor bedroom and one 8" Flex Du”

“I have return vents in these walls which is between the garage and the living room. Sheet metal lines both sides of the current drywall where return cavities are. I already had an HVAC guy make sure the whole thing is air sealed from the garage. Obviously since the area is being used as an open cavity, there’s no insulation in the circled area. Does anyone have any thoughts on how to insulate this area without creating mold issues? My only thought is to frame out a second wall and add untamed ba”

“Is it worth adding an HVAC return behind a door, or will the drawbacks outweigh the benefits? It is the hottest room in the house. HVAC is located behind the double doors and the possible return vent will be behind the single door. I should also add there is a supply vent right above where the single door is. submitted by /u/coituscloaker [link] [comments]”

submitted by /u/warfalock [link] [comments]

“Basically, I have two supply air ducts going upstairs in a 1.5 story house, and no return up there. I could use this vertical opening in the image that runs parallel to an existing supply, but there are cables/wires as you can see (and some more above it too). Would that be okay or does it go against some code? Other option is to convert one of the supplies into a return, which I wouldn't prefer submitted by /u/notABotThen [link] [comments]”

“I live in 25 year old house, 4100 sf, 2 units. The master bedroom is downstairs. The venting is in the foundation. While the AC works fine, that bedroom is always 2-3 degrees warmer than the rest of the downstairs in the summer. The vents are open but under furniture. There are plastic air deflectors to direct air into the room. Is there anything I can do to increase airflow to that room? Thanks! submitted by /u/Proper-Resource-1534 [link] [comments]”

“Just replaced a 30 year old 2 ton heat pump with a brand new Mitsubishi one of the same size. Unit is only for upstairs, downstairs has a separate unit. New unit can’t keep up and won’t hold temperature on warm days. Contractor says it’s a ductwork problem and the ducts are old. Return is modern but only R4.2, some are older with zero insulation. He’s recommending we replace all the ducts and put small returns in every bedroom for better air circulation. He’s saying all our cold air goes down th”

“I dont know much about good practice in hvac, but this just seems wrong. We are in houston and its the middle of the summer. A c company said we need to somehow plug the gable soffitt vents to stop condensation( again we are in houston and this is a vented attic outside of conditioned space)and i think thats sounds stupid as hell. i'm thinking, doesn't this just need a bigger drip pan? Looking for opinions submitted by /u/saucy_goth [link] [comments]”

“I'm a tenant living in a 1,000sqft single floor house. The HVAC system uses electric AC and gas furnace, the thermostat is in the hallway under the return vent. Today's weather is 82°F with 75% humidity. I set the thermostat to 70°F AC Auto, the cycle lasted just under 40 minutes before shutting off. My question, is that a normal cycle with today's weather? Or is that too long of a cycle for the HVAC system? FYA, I try to keep my thermostat at 69-70F during summer days and 67F when I”

“I have a DX unit for my condo. My former living room, now secondary bedroom have hot and cold air flowing from the vent (first photo) but I can only feel it when I'm up close on a ladder. The room is 10 ft height. All my other rooms don't have this problem, I can feel standing under it without a ladder in the other rooms. I can even feel the one in the bathroom. I thought that maybe the duct is disconnected somehow. The second image is the air vent that is closest to the evaporator and i”

“We had an HVAC company come out do an efficiency assessment. When we walk from our hallway to the living room/kitchen we feel the temperature difference immediately. It is hotter there than it is in the other part of the house. Our home has high ceilings (16 feet) in the living room, kitchen, and master bedroom. The other bedrooms, guest bathroom, and hallway have normal height ceilings. These areas stay cool and reflect what the thermostat is set to. They did their assessment and show that our”

“I dislike the vents on our hvac access door. Multiple contractors I’ve had in the house have told me we likely don’t need them at all, but I keep forgetting to ask our hvac guy when he’s here for seasonal checks. The return vent is located in the hallway directly behind this. Photo of the door w vents and the unit inside, in case that makes a difference. submitted by /u/GenericReditAccount [link] [comments]”

“Bedroom return air vent is at the top of the wall. The unlined duct is basically just the wall cavity (as are all of our return ducts). This photo is taken down into the wall from the return vent opening. The vent smelled musty last night after rain so I looked in and found this tear in the exterior blackboard. It didnt feel wet, but still seems like an issue. What should I use to patch up this tear? Not a lot of clearance to work with. I know we should probably move the return ducy or line it w”

“Does the system work best when every room is open, so it can pull all the hot air out through the main intake? submitted by /u/templeofsyrinx1 [link] [comments]”

“So, I know the general advice is do not close vents in an unused room, because it can create backpressure, and cause issues like leakage, humidity, and overworking the blower fan. However, this room is towards the end of the line, and the hvac vents seem to be connected to the same duct line, with 2 vents. Is it fine to close one vent, I would assume the one that comes earlier if at all. The double vent master bedroom gets noticeably cooler than the rest of the house, even with the door opened a”

“I have a 30-year-old house with new R60 insulation and a few years on the HVAC unit. The initial install had to run the return air duct down the same basement hallway as the supply duct, which limited the return air volume. This was later fixed by adding a 10inch return in the basement of this two-story rambler, and now we get good airflow. question is. With the introduction of the 10inch return on the floor of the finished basement, it never really returns any of the hotter air upstairs. i have”

“My house was built in 1976 and I've done a lot of experiments to figure out what could be causing this issue. One side of the house that's kinda hidden down a hallway (2 bed rooms and one bathroom and garage door) is way warmer than the rest of the house. I've put thermometers in each room over the past few years and kept an eye on them. The rooms like the kitchen or living room or master bedroom are always pretty okay and cool and bearable. My one bedroom on that side of the house w”

“Hey everyone, could really use some advice on how its recommended to fix a bedroom thats hotter than the others. Master (top right) is the farthest point in the house from the HVAC. Heres a rudimentary drawing of the system in the house. Does not encompass all vents actually routed. I'm pretty handy and don't mind reworking some stuff, adding ducts/vents, balance valves ,ect if that would help. I would really appreciate any advice. Thanks! submitted by /u/Glidersarecool [link”

“This is on one side of the house. Went up there due to one of the vents not blowing out as strong as the others. submitted by /u/bubba_Head [link] [comments]”