For general questions regarding cooling your home.

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4
votes
3answers
42k views

How do I install an air conditioner on a horizontal sliding window?

There isn't a great amount of literature on this subject it seems. I have an air conditioner, the manual assumes that you have a vertical sliding window, but I have one that slides horizontal, so how ...
4
votes
1answer
979 views

A/C escaping down the staircase

I live on the second floor of a century-old house that doesn't have central air. We have a large window A/C unit in the main hall but our front door is at the bottom of the stairs rather than the top. ...
4
votes
1answer
3k views

AC in the attic affects downstairs but not upstairs

We have one AC unit (roughly 1 year old) connected to two zones: Zone 1 is upstairs and Zone 2 is downstairs. Yesterday, our AC seemed to completely stop working for the upstairs but continue to work ...
4
votes
2answers
138 views

Dust reduction and removal?

I have a room with west facing windows (I dont think the direction bears any importance to this question), but for some reason this room seems to accumulate dust on surfaces a lot faster than other ...
4
votes
3answers
1k views

How can I redirect the discharge of my forced air vent?

An AC/heating register on our kitchen ceiling blows air directly toward a gas cooktop causing the flames to flicker. Adjusting the register doesn't seem to make a difference. I've looked into air ...
4
votes
1answer
992 views

How can I protect A/C condenser wires?

I bought a replacement condenser fan motor for my outdoor A/C unit. The old unit was CW direction only. This one is CW/CCW and has 4 wires stick out of the side that change direction depending on how ...
3
votes
5answers
14k views

What can cause the capacitor in an air conditioner to fail?

I just had the capacitor on my air conditioner fail. It was explained to me that the reason for this was the oil inside the capacitor got too hot, expanded, made the whole thing bulge, and no more ...
3
votes
5answers
34k views

How much less power does a three-phase air conditioning unit use than a one phase unit?

I'm planning to install a 5 ton central AC. I'm deciding between a condensing unit that runs on 220V and a costlier unit that runs on 207Y three-phase. My understanding is that three-phase motors use ...
3
votes
6answers
1k views

Air Conditioner Can't Keep up

We just rented a condo and our A/C cannot keep up so it will run almost constantly. It can't even keep the temperature constant, it will creep up into the 80s even while running. I measured the ...
3
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11answers
7k views

Solution for A/C Condensate Drain Line that doesn't require emptying a bucket of water every day?

I have a split A/C system in a room that runs on low 24 hours a day during Summer that unfortunately cannot be connected to any drain or pipe and which therefore requires a bucket outside to be used ...
3
votes
3answers
320 views

How can I turn the light off on my fujistu halycon split unit

I run the A/C at night and the unit has green lights that turn on to indicate its on. How can I turn the lights off without turning the A/C off?
3
votes
2answers
2k views

Besides insulation and air conditioning unit, what else is there to check if my A/C isn't keeping me cool?

I live in an apartment home where the indoor temperature has risen to above 80 degrees Fahrenheit daily for the past two months. The outdoor temperature regularly reaches 100 degrees and the weather ...
3
votes
4answers
10k views

Why won't my AC system turn off after I flipped the breaker?

We've got a central cooling air conditioner that was installed in 1984 with a thermostat from that same year. We are replacing the thermostat with a new programmable one (which has a 100% ...
3
votes
2answers
447 views

Are clogs in the AC condensate drain common in Florida?

I have a two year old central A/C unit. Every 2/3 months the unit shuts off. I called the rep/maintenance company and they have given me the following response: The cause of the issue is algae ...
3
votes
3answers
1k views

Apartment cooling with fans

I've just moved into an apartment without an air conditioner in Sunnyvale, California. The weather is not too hot, but there are going to be some pretty warm days in the summer, especially since I'm ...
3
votes
2answers
826 views

Can I cut a hole in the brick to install a through the wall air conditioner in a basement?

I am looking to install a through the wall air conditioner in the basement. I don't want to block the one window. There is already a window in the brick. I don't know if there is any kind of ...
3
votes
2answers
2k views

How do I properly frame an opening to angle a through-wall air conditioner?

I'm going to install a through-wall air conditioner using a purpose-built sleeve. The instructions from the manufacturer say to install it such that it angles slightly downwards to the outside (about ...
3
votes
4answers
13k views

Is there a window or portable AC system I can use with an awning window?

My bedroom gets ridiculously hot and I taped tin foil over the window. It didn't help much. I'm thinking of getting an air conditioner but the ledge on the window is small and the window doesn't open ...
3
votes
2answers
1k views

How to safely install a window AC unit?

I have a standard air conditioner. I have just dropped it into the window and slammed the window closed. I am just a bit concerned that If there were high winds or an earthquake the unit could drop ...
3
votes
1answer
6k views

Air deflectors on floor registers and cooling efficiency

I was once told by an HVAC technician to avoid using air deflectors on floor registers during the summer. The reason was that the last thing you want to do is to direct the heavier, colder air ...
3
votes
1answer
350 views

Is it possible to override building-wide air-conditioning settings?

I live in an apartment building (high rise). The ac is off and they won't turn it on for another month!! Meanwhile it is 90f inside and I can't sleep!! Is it possible to overide? We do have a unit in ...
3
votes
1answer
258 views

Is this mold on my AC vent?

I went to close the AC vent in the apartment we're renting and saw this. Is this mold or just many years of dust buildup? If it is mold, can I safely just remove the vent and wash it?
3
votes
2answers
2k views

Can I attach a HEPA filter to the HVAC outlet?

I am currently living in China and want to improve the indoor air-quality. We have a Hitachi R410A HVAC. All the room in the house are controlled separately. Just to make it clear up front, I am not a ...
3
votes
1answer
21k views

How do I install an air conditioner in a larger window?

I have a brand new AC in the box which was meant for another room, but recently had a baby and her room is too hot. I want to use the AC I already purchased, but the max window width is 36" and the ...
3
votes
3answers
2k views

How do I determine if adding an air conditioner will overload a circuit?

I'm going to take advantage of some Memorial Day sales and pull the trigger on a portable AC unit for my "basement-ish" (bottom of windowsill is mid chest, rather than head height) apartment. Before ...
3
votes
1answer
221 views

Improve AC flow to secondary ducts

I have an AC which has 3 ducts coming out of it. Only one duct gets flow - I'm guessing the AC fan blows right into it. What can I do to improve the flow?
3
votes
3answers
527 views

Can I use an outlet splitter with my air conditioner?

I live in an old apartment building, and there is only a single outlet anywhere near the only window in my living room. My Air Conditioner works great with it, but now I can't use the desk lamp and ...
3
votes
1answer
534 views

180º/gooseneck/u-shaped cold air return?

I am in the planning stages of moving a cold air return from an inconvenient spot in the floor to a nearby wall. The basic plan is to open up the wall on both sides (cutting one stud and framing in a ...
3
votes
2answers
3k views

How can I calculate the Btus needed for a single room A/C unit?

How many Btus is recommended for a room about 35 square meters? I have 2 units with 13,000 Btus each. I'm thinking it should be enough, but the room is just so-so cool. I can never say it's COLD in ...
3
votes
2answers
4k views

What type of air conditioner can bring in outside air?

Car air conditioners usually have the option to choose circulate on/off. What about house air conditioners? For instance, does a window air conditioner exchange air inside and outside the house?
3
votes
6answers
40k views

What could be causing an A/C blower motor to turn off randomly?

The Blower motor on my AC unit turns off at random times while the outside unit continues to run which is causing the coil to freeze up. The blower won't come on for 30-45 minutes after the AC has ...
3
votes
2answers
2k views

Is there a through-the-wall A/C that works with external thermostats?

Our two-story A-frame house only has duct-work downstairs in the crawl-space, with vents in the floor. It gets quite hot upstairs during the summer, but because the square footage of the upper floor ...
3
votes
1answer
45 views

Mounting a window air conditioner on top of a sliding horizontal window

I need to install a window air conditioner in my master bedroom. However, the only suitable window there is a horizontal sliding window. To complicate things more, I need to place it on top, since my ...
3
votes
1answer
75 views

How can I fix a leaky A/C evaporator?

We just moved into our new place. So many new things need to learn. Just like the problematic AC. My apologizes if I do not know the correct terminology for some of the parts. I will try my best ...
3
votes
2answers
1k views

Are there optimal positions for A/C and heat register grills to be facing?

I noticed a while ago that some of my A/C and heat register grills are facing the walls and not the room (the insides of the curves on the grills face the walls) in some rooms but not in others. My ...
3
votes
2answers
419 views

What is the smell coming through my HVAC system?

If I leave the furnace fan always running for an extended period of time (to circulate and filter the air), when the central AC turns on there is a not-so-fresh smell that is emitted through the ...
3
votes
2answers
3k views

Do I need to replace soaking wet insulation resulting from a plugged A/C drain?

I had a company install an A/C evaporator unit on my existing heating system. A plugged drain caused the plastic pan inside the evaporator to overflow with water, which then ran out through the metal ...
3
votes
1answer
1k views

How do I replace an A/C diffuser attached to flex duct?

Our house has central air, with the air distributed via flex ducts around the house. On the second floor, the diffusers have baffles behind them that can be closed when the system is not in use, but ...
3
votes
2answers
4k views

Should my evaporator be hissing? Should cold air be blowing from it?

My A/C hasn't been able to keep up with the heat lately (it's been in the high 90's with high humidity, and today the house was up to about 82 inside even though it's set on 70). I went up into the ...
3
votes
1answer
437 views

What is the life expectancy of an air conditioning unit with a booster?

Over the weekend my wife and I lost our air conditioning. I called a technician out to the house and he replaced both the fan motor and the capacitor. He also had to install a booster to help get my ...
3
votes
2answers
5k views

Is it OK for air conditioning condensation to drip right next to the house?

Our house has a 3/4" PVC pipe coming out the side which drains condensation from the central air conditioning. It drips at what seems like a normal rate. Taking a wild guess, I'd say a gallon per day. ...
3
votes
1answer
5k views

Where should I tap in to the existing duct work?

Bought a 1981 repo a year ago. The house measures around 900 SQFT. I enclosed the one car garage (10'x20') @ 200 SQFT to serve as an office. The front of the garage is insulated (10') along with the ...
3
votes
1answer
191 views

How can I determine which MERV filters would be best for my air handler?

I have a Carrier 3.5 ton, 1/2HP air handler (Model Number:fc4bnf042). I have been using MERV 13 a/c filters for a few years now because my son has allergies. I recently discovered that the higher ...
2
votes
5answers
10k views

Can a portable air conditioner be used to reduce moisture in a room?

I live in a flat in an older house and I have the disadvantage of living next to an outer wall. In autums/springs there is a period when the central heating isn't turned on yet, but it's already ...
2
votes
4answers
451 views

Is there any alternate of conventional Air Conditioner?

Is there any alternate of conventional Air Conditioner, which are costly and increasing green house effect?
2
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7answers
17k views

What are my options to level out my air conditioner?

The air conditioner on the side of my house is on a small slab of concrete. Over time, it has started to tilt as the land has settled. We just recently moved in and a few of the neighbors have ...
2
votes
2answers
180 views

What could cause my in-wall air conditioner to blow 3 power boards?

I've had my house for nearly two years, and suddenly my in-wall air conditioner stopped working. I replaced the main power board, and it worked again...for a week. I replaced the main power board ...
2
votes
2answers
13k views

AC Unit Blow Warm Air Indoor But Colder Air Outdoor

I have two AC Units. One for upstairs and one for downstairs. The upstairs one works just fine but not the downstairs. So, i did a test by turning both units on and went outside to compare the two ...
2
votes
2answers
2k views

Is a little ice on the cooling coils ok?

This is our first summer in a new house which has central air. It was a bit hotter today than normal so the AC was running for a long time. After awhile we noticed the airflow stopped because the ...
2
votes
2answers
2k views

Home A/C Repair/Replacement quotes are very different. Which one to go with?

I recently have been having issues with my A/C unit on my Condo which was built in 1986. This unit might very well be the original A/C unit. It has two components, the fan outside and the air handler ...