Questions tagged [air-conditioning]

For general questions regarding cooling your home.

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Are new aircons with less BTUs more efficient than the older ones?

I am trying to replace the air conditioning device at home but I am not sure how to compare my old Panasonic that was bought in 1999 (possibly model of 1997 or 1998). Some facts: I was not able to ...
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1 vote
2 answers
56 views

Fan Coil connected to Heat Pump raises humidity in cooling mode

I own an apartment with a Daikin heat pump system that provides me both with heating/cooling and hot water. The system has both in-floor heating and 4 fan coils hooked up to it, and these are on 2 ...
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1 vote
1 answer
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How to measure current draw of AC condenser fan motor, single phase?

This question is a follow-up from a related question about an AC tech recommending a likely unnecessary fan motor replacement. See Rust on outdoor ac fan motor? Tech recommends replacement? I'm trying ...
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3 votes
1 answer
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+50

Rust on outdoor ac fan motor? Tech recommends replacement?

I had my annual ac inspection. House has two units and one runs about twice as long each day as the other because it cools much more of the house, and had its capacitor fail two years ago. Tech ...
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1 vote
3 answers
87 views

Can I set a portable AC unit back in a dormer window?

My office is on the 3rd floor and it's pretty hot in the summer. I wanted to get a window AC unit, but the windows are dormer windows, so there is no outer vertical surface on which to mount a support ...
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1 vote
0 answers
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Mounting external component of split AC on hollow brick wall

I have a small split system (Philco Phs25ha4cpi). The external component weighs 25kg, and I have mounting brackets like these: And a wall made from bricks like these: My question is what kinds of ...
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2 votes
1 answer
77 views

Gain access behind Daikin ductless air conditioner indoor unit

When the ductless indoor unit was installed a hole was cut in the drywall behind the unit and smoke from my neighbour's apartment is coming in through the opening into my home. Is it possible for me ...
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1 answer
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Why does my furnace blower turn on when the thermostat is turned off?

The weather has been nice so we have had our thermostat turned off for about a month. The other night it turned on randomly and started blowing warmer to hot air getting the temperature to 78 degrees ...
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3 answers
68 views

How can I clean this kind of filter? Is it the reason why very little air is coming from the vents and the house is not getting cooler?

When we turn on the air conditioning, very little air is coming through the vents. It has not been cooling the house at all. It still will get up to about 80° on the hot days. Battery of the ...
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1 vote
2 answers
131 views

Musty smell from furnace

When switching from cooling to heating in the fall we get about 2-3 days of musty air and then it's fine all winter. It's like wet sock/sneaker smell. Yesterday, the A/C kicked on because our house ...
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0 votes
3 answers
83 views

How to seal this type of window for portable air conditioner?

I'm living in an apartment where my bedroom has no windows opening to the outside of the building, only one window which opens into the living space. As such, the room is tough to ventilate and gets ...
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0 votes
2 answers
57 views

Installing air conditioner in outdoor building

I have an outdoor building (327 sqft with tall ceilings) that I am using as a gym. It is basically 2x4s and plywood with a concrete floor. I want to put in an air conditioner for the summer months ...
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2 answers
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Do most apartment HVACs take in outdoor air or do they usually only recirculate indoor air?

The apartment is a new construction, where each unit has its own HVAC (air handler?), and it looks like something like this: When we turn on the heat or AC, conditioned air comes out of the vents. We ...
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2 votes
2 answers
104 views

Ductless mini-split AC with multiple indoor units for a home with small bedrooms?

Location: US, NYC. I want to improve the air conditioning setup for an apartment in a 2-family house. Current situation: 200 sq ft master bedroom, horrible old through-the-wall AC on a dedicated 20A ...
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0 votes
1 answer
48 views

Can convertible cooling AC from Carrier lower its capacity for small room?

I am planning to install a split 1.5 ton convertible inverter ac from Carrier in a room of size ~100 sq ft. It's unnecessary I know but we would eventually move into a bigger house with bigger rooms ~...
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0 votes
1 answer
56 views

Do wall ac/heater units bring in fresh air?

I live in an apartment with a combined wall AC/heater unit, like the type that you often find in hotels. Does this bring in fresh air when operating, or does it just recirculate the air inside the ...
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inverter, air conditioning, electricity savings

Having two AC units of the same BTU and EER, one inverter one non-inverter, is my understanding correct that the inverter unit will still run on less power than the non-inverter unit only due to less ...
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  • 121
3 votes
1 answer
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Is it a good idea to go all ductless? [closed]

I have a 2000 sq ft house in TN(mostly air-conditioning is used, winter is mild) and the house has 2 trane gas furnace for heating(both 25+ yrs old) that need to be replaced, one 25+ yr old air ...
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-2 votes
1 answer
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Pump to push inverter A/C dripping water?

I live on the top floor of the building and my bedroom has an inverter A/C that naturally drips water to the street. The bedroom has access to the roof. Is there some inexpensive pump that will push ...
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  • 1,817
3 votes
3 answers
805 views

Is it more efficient to heat a room using an air conditioner (heat pump) when the windows are open?

In general, using an air-conditioner for heating is more efficient than a standard electric heater or radiator. But in our home, we keep the windows open all the time, in order to decrease the chance ...
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0 votes
0 answers
42 views

are window unit ACs supposed to let in air when turned off?

I live in an ancient building in a large, old city. I just replaced two decades-old window ACs that came with the place, and the new units let in air. Before I added insulation, when it got cold ...
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1 answer
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What Massachusetts licence(s) are required for multisplit installation by the homeowner?

I'm looking at a 3-circuit 2.5 ton MrCool DIY multi-split. The utility wants it installed by a licensed contractor as condition for rebate, but other than the electrical hookup, it is not clear what ...
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What is the meaning of "#def" in a Tornado air conditioner?

I washed the dust off my filters of the Tornado air conditioner unit in my room. After I put them back in place, the air conditioner does not heat: when I put it in "heat" condition, I see &...
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0 votes
4 answers
84 views

Is DIYing a replacement of Electric Furnace and Air conditioner worth it?

My Air conditioner does not produce cold air, however heater part in Furnace works just fine. Air conditoner Unit is at least 20 years old and have no coolent left in the system. I am looking to ...
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1 vote
1 answer
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What does a mni split AC do for thermostat?

I have a Hessaire mini split in a garage room. It's installed in the wall and has a remote. It acts like it has thermostat control (you can set the temp), but it is all over the place temperature ...
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  • 179
-1 votes
1 answer
148 views

Split AC Unit won't turn on after an explosion sound

I have a Split AC Unit and it had been working fine for a while, but one day I turned on the switch for my AC and I heard a loud explosion sound emanate from the indoor unit. After that, I couldn't ...
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0 answers
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New Condenser FAN motor not turning on with the DF2 on new Goodman Defrost Control Board

I bought the following Defrost Control Board PCBDM101S for my Goodman CPLI41-1 Condenser because I found a black scorched mark on the old board. I thought this was the main reason for my fan motor not ...
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0 votes
0 answers
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Is my HVAC condenser fan motor wired incorrectly?

My condenser fan motor stopped working and I noticed black scorched marks on the Defrost Control Board where the fan connection is (near DF2 and the relay that is used to run the fan). The HVAC ...
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  • 101
0 votes
1 answer
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Artificially lowering CO2 concentration

Is there any way to realistically lower CO2 concentration in living rooms? Today only way to lower CO2 concentration is to basically bring the "fresh" air from the outside. But this is ...
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0 answers
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How to get good HVAC quotes?

My natural gas furnace and air conditioner are 20 years old. I plan to gather quotes to replace them both. What do I need to do so that I get good quotes? I've heard HVAC contractors talk in an online ...
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0 votes
1 answer
51 views

types of air conditioning units

I recently moved into a ~670 sq ft condo and it has an old “all in one” HVAC unit. It's currently in a closet, but I would like to reclaim that closet space and move all components to the roof. I ...
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0 votes
1 answer
120 views

Impact of Air Conditioner on plywood

I am going to set up a cupboard on a room which has AC. I'm wondering what would be the effect of running an AC on 22 degree Celsius(Normal room temperature would be 30 to 35 degree depending on the ...
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0 votes
2 answers
108 views

Why does my compressor make a loud squealing noise as HVAC system shuts off?

Is it a dangerous condition if the compressor makes this squealing noise? I left my home for two weeks and when I came back my condenser fan motor wasn't working. So my compressor was running non-stop ...
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  • 101
0 votes
2 answers
65 views

Need I needed AC/Furnace replacement, or I can delay it for a year or two

I'm living in the Northeast of the US, so my ac/heat units are 12 years. My current setup is like this: Heat-pump on unit outside the house, and a furnace unit in the attic. The heat was not able to ...
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0 votes
1 answer
68 views

How often to run an air conditioner that is otherwise unused?

I have through-the-wall air conditioners that I normally don't run. I live in the tropics, it's warm every day, but we have cooling trade winds and ceiling fans, and it's rarely so hot that I want air ...
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  • 111
2 votes
1 answer
71 views

What is the minimum allowed distance an AC breaker can be placed from the AC unit?

I have a separate external AC breaker box in the middle of a wall and I'd like to move the AC breaker box closer to the AC unit so I can do something unrelated with that wall. I understand that the ...
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  • 121
2 votes
1 answer
151 views

How do I fix a loud intake vent?

In the master bedroom, there is one of four intake vents in the house, and this particular one is very loud. Our house has two vertical air shafts that run parallel to each other, one for supply and ...
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  • 554
0 votes
0 answers
71 views

One room is always the hottest in the house

Whether it's winter or summer, hot or cold outside, my bedroom is always the hottest in the house. I have taken temperature readings and the air temperature can exceed 85 degrees. I have a fan almost ...
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  • 554
0 votes
1 answer
118 views

What happens if you wire a multi-split airconditioner wrong?

I got an air conditioner installed with 2 indoor units but during the process, we lost track of with line set went to unit A and unit B. The same goes for the electricity cables. I can't follow where ...
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2 votes
1 answer
66 views

Will rigid air conduit improve flow, over flexible ones

My top room (3rd floor) has poor airflow, from a central air (cool and heat). Looking in the attic, I found flexible ducts that go over many curves. I feel like the duct are getting compressed/bent at ...
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-2 votes
2 answers
153 views

How to prevent electrical appliances from exploding

I've been reading news lately that AC or fridge explodes sometimes and causes fire and death. What are the other household electrical appliances that explodes ? How may I prevent this ? Is there any ...
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0 votes
1 answer
75 views

Preventing air conditioner from running when temp is below 65 degrees outside

Could l wire a thermostat outside and and set is to 68 degrees and use it as a switch to prevent the air conditioner condenser from running when below 68 degrees. And use in-line with the yellow wire.
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0 votes
0 answers
36 views

Casement Windows: Install Thru Wall A/C Indoors & Exhaust with Ducting

A family member has a business in a century-old building that only has industrial casement, awning, and pivot windows. There's no central A/C & a mini-split can't be hung outside the building. The ...
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-1 votes
2 answers
279 views

What kind of conduit do I need for my mini split AC line?

Running 240V for mini split through exterior wall in conduit from indoor unit to outdoor unit. Cable supplied by mfg is SJOW 16/4 105c 251603 3/8" O.D. Can use 3/4" non metalic flex conduit (...
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0 votes
0 answers
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Keep blowing 3 amp fuse at furnace

Keep blowing 3 amp fuse on the furnace control board. At the furnace I am getting 240 on the 60 amp breaker at the furnace and I am getting 120 on 30 amp breaker breaker side.
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1 vote
0 answers
40 views

Head Scratcher: Mini Split Conduit Question [duplicate]

I'm installing a Mr Cool 24K BTU DIY mini split 240v system. It's replacing one that worked flawlessly for 2 years. The manufacturer replaced my original one because of a manufacturing defect - ...
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0 votes
1 answer
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Is my HVAC compressor siezed?

My R22 HVAC system stopped working. Trying to see if there is anything else I can do When the compressor kicks on I hear a buzzing sound (presumably when the capacitor is in start mode) and a hen goes ...
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  • 105
0 votes
3 answers
81 views

Split air con : getting outside air inside

I have a split air con Samsung SH09APG. It's a typical air con machine, with an inside and outside unit. I was thinking it would be really useful if it allowed the outside air to come inside the house....
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  • 343
-1 votes
1 answer
107 views

Best vent size for replacing drop-ceiling register with boot for drywall using 8" duct?

I'm replacing my drop-ceiling with drywall in a basement room. Right now there is one register on an 8" duct – the kind where the duct is just open and passes through a perforated 2'x2' grille ...
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0 votes
2 answers
142 views

If I build walls surrounding sump pump, water heater, furnace, A/C, will it work stopping flood water from spreading to entire basement?

In the past, my basement was flooded twice. Both of which where lower than 8". I'm wondering if the following works to prevent future flooding of my basement or stop water from spreading to the ...
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