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Questions tagged [air-conditioning]

For general questions regarding cooling your home.

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AC, Is it normal? The outside wind enters the house through the AC fan

I got a renovated house last summer, so the air-conditioner was new product. But when I turned on at first, it blowed so hot air. During the summer, I'd always turned on turbo mode 24hours, yet still ...
user188584's user avatar
1 vote
1 answer
59 views

How to determine the proper capacitor for my air conditioner unit? Tech claimed the one installed is wrong

tl;dr - What should I be searching for in documentation to find the correct capacitor for my outdoor AC unit or what inputs do I use to calculate the appropriate capacitor? My AC has an intermittent ...
HelpEric's user avatar
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Running AC vent hose through water heater closet?

Is there a safety risk if I run an AC vent hose through the water heater closet? I don't mean venting the AC exhaust into the closet. The hose would run through there and then out one of two large ...
Michael Giles's user avatar
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39 views

Portable AC unit takes a long time before it finally starts blowing air

I have a portable AC unit in my room which has the issue of not starting or taking very long to start blowing air, let alone cold air. Once it finally starts blowing air however, it works fine and you ...
Max R's user avatar
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2 answers
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Cooling the garage in the summer: what do you think of my air conditioning plan?

I am leaning towards buying a 12000 BTU portable air conditioner for around $300, and paying a handyman to install a vent in my garage for $300. That should end up at $600 for an adequate system for ...
Michael Giles's user avatar
2 votes
2 answers
806 views

Should copper tubes be sealed when removing aircons?

There are about 75 feet of copper tubes for split type aircons in a building. If the aircon would be removed. Should you seal the copper tubes? If not, how long can it remain unsealed before a new ...
Jtl's user avatar
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1 vote
1 answer
23 views

Nest Power Connector (C Wire) on A/C unit GMP075-4

I’m trying to use a Nest thermostat on my older Goodman GMP075-4 unit. I have a Y, R, W, and G connector for the thermostat. I’ve read through a few number of the other questions related to this on ...
ariagno's user avatar
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Home Preparation For Air Conditioner Installation

How can prepare myself for air conditioner installation when focusing on energy efficiency. Is there any anything i need to know? Please help me for Optimizing Energy Efficiency
kevinkemp's user avatar
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Where should I install duct take-offs on a return plenum box?

I have a 5-ton system. My goal is to add an 8" return duct to a 15x9 guest room that has an 8" supply but no return air. When I went up to the attic to review my options, I saw that the ...
yayza's user avatar
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The technician installed a new AC split without a vacuum pump

The technician installed a new AC split without a vacuum pump. (Gree 24000 BTU Inverter) Should we drain the refrigerant, do vacuum, and refill the refrigerant? It is written in the AC manual that we ...
Hadi's user avatar
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Would this type of window insulation be effective in cooling my room and keep heat out?

I have 2 sliding windows in my room, both windows have window type AC units either in front or next to the back-side of the AC units (I guess the radiator/hot side of the AC. Idk much about AC parts). ...
hskankpvjsk's user avatar
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My AC makes whooshing sound and deep cleaning fixes it. But it reoccurs within few months

The air conditioner in my bedroom is a Fujitsu General ASGA-18SEFT 1.5 ton. FYI I live in a hot and humid weather. For the last few months I am facing a weird issue with it. In March 2023, i noticed ...
Econ_newbie's user avatar
1 vote
1 answer
37 views

Suction pipe freezing when blower is on low speed, and runs fine when blower turned to high speed!

I have 12000BTU unit running on R22, and I'm facing a strange issue with my split AC. When I run it with the indoor blower on low speed, the outdoor starts freezing on the suction pipe. But as soon as ...
omsharp's user avatar
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Basement Finishing Heat/AC

So I have a 28ftx25ft basement wide open basement that i'm looking to frame and finish and need to make some choices on heat and cooling. For heat I have the extra BTUs on my furnace to run a second ...
Joe's user avatar
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Won't the secondary condensate p trap evaporate?

So my understanding is that both the primary and secondary condensate drain lines should have p traps installed to prevent air ingress (or egress depending of it's a positive or negative air system). ...
James's user avatar
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121 views

Adding return air vents in bedrooms to reduce return air noise and increase total return air capacity

I did my homework here the best I could and I hope someone can help by checking my work. In an attempt to make things as clear as possible, I made the following diagram. This is my existing system ...
deefofum's user avatar
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AC blowing hot air. Smart thermostat wiring wrong or something else?

I installed a Honeywell Wi-Fi smart color 7 day programmable thermostat (model #RTH9585WF) on 11/27/23. The wiring directions on it didn't exactly match my old thermostat so I posted on a forum and ...
Derek Gilbert's user avatar
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2 answers
68 views

Why does my AC compressor stop after a while?

Our air conditioner appears to be experiencing a strange problem. After one to two hours the air compressor would shut down or fail to kick in. It'd reset itself after turning off for a couple of ...
John M.'s user avatar
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-1 votes
1 answer
34 views

Common terminal question on old furnace and air conditioner with new smart thermostat

Trying to solve an odd problem with my T5 Lyric smart thermostat and an old furnace/AC. I'll try and be concise. The model of furnace is: Goodman, GMP075-4 Rev B Details, and photos below for help: ...
thegreataus's user avatar
2 votes
2 answers
1k views

What is the best way to add a vent over this door?

I would like to add a vent above the door to my laundry room because it gets fairly warm in there when the door is left closed for any significant amount of time. All that's there is a single layer of ...
5E4ME's user avatar
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2 answers
483 views

Why is my neighbor's A/C causing my walls to sweat?

Whenever my neighbor runs their air conditioner for an extended period, my room, which shares a concrete wall with theirs, experiences condensation issues (my wall starts to 'sweat'). After ...
user2965583's user avatar
0 votes
1 answer
90 views

Place heat pump unit on concrete walkway or dirt/gravel?

The picture shows the location for a new heat pump. And as part of an upcoming hardscaping project, we will pour concrete in all this area to build a walkway: We would like the HP to be installed ...
goldfrapp04's user avatar
1 vote
1 answer
59 views

First finishing project: Attic or Basement for office/studio? [closed]

First time homeowner here, 100 year-old brick bungalo in Chicago where we have very cold Winters and hot Summers. I have my choice of an unfinished basement or unfinished attic to build my home office/...
Zendo Brendo's user avatar
1 vote
2 answers
242 views

A/C vent not connected to duct?

So I am in the process of doing a light reno to a bathroom in my 1954 ranch style home and I took off the a/c vent to wash it and/or buy a new one. To my surprise (okay not really surprise— there was ...
Olivia's user avatar
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0 votes
2 answers
359 views

How to run a 220v mini split on 110v wired home

I have an off grid apt in Baja California Mexico. The apt is wired for 110v. I would like to integrate an ac200max solar generator as well as a 550w dual dual generator. How can I integrate all of ...
O M G's user avatar
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1 vote
1 answer
583 views

Is it okay to have an air handler in an uninsulated attic or will the air handler have to work harder?

We live in CT -- so cold winters. I don't know all the right/technical terms, but this is our situation: Split level ranch (two floors plus attic) Gas furnace and gas water heater in the basement Air ...
IMTheNachoMan's user avatar
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1 answer
49 views

Does the BTU change on different fan speeds? [duplicate]

I can only find a 14,000 btu window a/c for my small room. I really only need an 8,000 or 10,000 btu but can’t get one in my area. I was just wondering if I kept a/c on lowest speed, would the btu ...
Pixie's user avatar
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0 answers
46 views

How to Airseal and Insulate Texas Homes

I am interested in what I can do to help improve the energy efficiency of older Texas homes. I am looking to purchase one in the new year but it is my understanding that in 2012 the energy efficiency ...
Lance's user avatar
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0 answers
420 views

Air conditioner outside unit / condenser does not come on when thermostat calls intermittently / usually works after switching break/pulling fuse

A few times over the past two weeks, my central AC unit would stop producing cool air. The inside fan (furnace blower?) would be working, but since the fan on the outside condenser was not running it ...
HelpEric's user avatar
  • 501
0 votes
3 answers
113 views

Installing a microwave oven and an AC unit with very tight current capacity

Recently, I moved in a 1 bedroom apartment unit with no already installed AC unit and microwave oven. Thus, I am thinking of installing them by myself, but I noticed a problem. The capicity of my ...
Yongmin Park's user avatar
0 votes
2 answers
153 views

Sizing charts for air conditioner or heat pump for humidity rather than cooling? 1-stage vs. 2-stage? 3-stage? [closed]

Inevitably I'll have to replace my heat pump, and when that time comes I'd like to have the calculations on the size of the replacement to account for dehumidifying in addition to heating and cooling. ...
MacGuffin's user avatar
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6 votes
3 answers
2k views

Blue liquid dripping from mini-split

I've recently noticed a blue streak running down on the wall under my mini-split indoor unit. I cleaned it but it came back after a couple of weeks. So I disassembled the unit and found from where it ...
Alex Millette's user avatar
0 votes
1 answer
271 views

Why is my AC unit making a loud buzzing noise?

This only happens maybe 1 out of 10 times the AC runs, maybe less, but the buzzing sound is aggressive enough that the neighboring wall on our home vibrates like the hood of an old truck. On the off ...
Jacksonkr's user avatar
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0 votes
0 answers
18 views

Rattling Supply Vent

I have a 4-ton HVAC system with 2 zones, with two separate thermostats for upstairs and downstairs (~1200sqft each floor). When only one zone is active (e.g upstairs) but the HVAC system is at full ...
Anuj's user avatar
  • 101
0 votes
0 answers
26 views

Ac unit will not come on

Someone instaled a 240v window ac unit line. They connected the white wire to the ground bar in the panel. The ac unit worked for a little while and turned off. Now the ac unit will not come back on. ...
Jason Reiley's user avatar
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0 answers
33 views

Can I reconfigure two 5" ducts into a single line & what size should they be?

I am trying to move a floor register location. Currently I have two 5" HVAC ducts being fed from a 6" x 10" rectangular trunk. The one 5" run has the register in the middle of ...
Moe's user avatar
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0 votes
0 answers
26 views

Minisplit Install With Thin-Walled Lineset

I'm currently installing a multi-zone minisplit in my home. Unfortunately, I bought the cheapest linesets I could find. The 1/4" line has thinner walls and is very difficult to flare and torque ...
scott's user avatar
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0 votes
1 answer
220 views

How to vent portable air conditioner in non-AC friendly condo

I live in Seattle in a 800sqft condo without central AC. I have a balcony with an outward swing door, tilt and turn windows, a fire place, and a dryer vent. I'm not allowed to use a window AC unit, so ...
rob's user avatar
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1 vote
2 answers
44 views

HVAC question about Evaporator Coil repair

My evaporator coil was recently replaced (Carrier CNPHP6024ALAAAAA replaced with a bigger unit, CVPMA6124XMC). They sealed around the edges with tape. The original install was sealed with some kind of ...
amrog's user avatar
  • 347
6 votes
6 answers
2k views

Insulating an open window with air conditioning pipe through it

I seek to install an on-floor AC and pipe its exhaust through a window (images below). The window is double, lower window being taller, and is elevated way above the origin exhaust pipe. I'm thinking ...
OverLordGoldDragon's user avatar
1 vote
1 answer
95 views

AC Evaporator coil died and replaced with a bigger unit

I hope I can ask this question here. I think my repair dude just pulled one over on me and would like to get some help if possible. My evaporator coil went out, Carrier model CNPHP6024ALAAAAA. I ...
amrog's user avatar
  • 347
8 votes
5 answers
3k views

Do on-wall air conditioners, mini splits, need expert installation or water replacements?

Picture below - says it heats and cools. For an AC like this, Are regular "refills" needed, like changing water/cartridges? Can I reasonably install it myself? I'm no DIY expert (Optional) ...
OverLordGoldDragon's user avatar
0 votes
1 answer
274 views

Venting a portable AC with a mesh window

We bought a portable AC. Unfortunately, our windows to the outside only open a certain amount and we don’t have the type of window shown in the video here where we can open it up and close (see ...
sharataka's user avatar
  • 101
0 votes
2 answers
63 views

Wiring thru the wall A/C

I need to wire a 20 amp, 240 volt, single yoke, double pole breaker for a thru the wall A/C. Also reknown as "115/240". Using 12g wire running 40 feet. I've seen this done using 12/2 and ...
Josh Scott's user avatar
0 votes
1 answer
33 views

2nd floor zone is blowing cold air out the return. Nothing from the usual vents

I could not turn it off just by setting that zone to off. The fan appears to be running in reverse. The only way I was able to stop it was to set the master zone downstairs to off. I am in my ...
Harry Mangurian's user avatar
2 votes
3 answers
512 views

Finding an air conditioner refrigerant leak that's completely empty

I have a central air conditioner that worked briefly when recharged professionally, but the refrigerant all leaked out within about a month, so there's a pretty substantial leak somewhere. It's a &...
masospaghetti's user avatar
0 votes
0 answers
39 views

Can anyone help me fix my AC unit

so we were having problems with a stripped wire that runs from the AC outside to the hvac inside so for a few days the ac did not work. We had someone come out and he ran a new wire but now the AC won'...
Erica C.'s user avatar
0 votes
1 answer
1k views

High pitched whistling coming from AC lines

Does anyone know what would cause a high pitched whistling noise to come from my AC lines when the AC isn't running? It seems like maybe there's some refrigerant or air trapped in the refrigerant ...
BUDA's user avatar
  • 1
2 votes
1 answer
290 views

Couple of questions on the outside unit of a split heat and A/C installation

I have a Viessmann heat and A/C installation where a single large common outside unit located on the roof connects to split units on three separate floors. First question: There is a pair of copper ...
Sabuncu's user avatar
  • 173
3 votes
2 answers
2k views

Should water be dripping from my furnace condensate line onto the basement floor?

I recently had a Lennox A/C and furnace installed. The condensate line drips water into the basement floor drain, as my old one did. But now there's also a little side vent in the line that is also ...
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