For general questions regarding cooling your home.

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3
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2answers
242 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
2answers
1k views

Can I use a swamp cooler to cool an AC unit's condenser?

Swamp coolers work great and use a fraction of the electricity of an air conditioner in a dry climate with little humidity (like Phoenix) but there are downsides like mold and, well, everything feels ...
3
votes
2answers
703 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
289 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 ...
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4answers
6k 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
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3answers
697 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
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2answers
7k views

Why is my A/C condenser fan motor wiring backwards, and how can I fix it?

I've just replaced my condenser fan motor on my home A/C unit with this unit: http://www.grainger.com/Grainger/GENERAL-ELECTRIC-Condenser-Fan-Motor-2PRA6 The HP, RPM's and amp ratings all match. The ...
3
votes
1answer
207 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?
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2answers
3k views

How do I install a jump duct?

Our master bedroom is considerably warmer than the living/dining/kitchen area of our house, and we've been setting the thermostat quite lower than we'd like in order for the bedroom to get cool enough ...
3
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1answer
156 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
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2answers
498 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 ...
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2answers
265 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
1answer
521 views

Will a board blocking my air conditioning break it?

I have a central air-conditioning system in my rented flat. There is on massive machine on my balcony which blows out hot air when the air-conditioning is in use. The hot air is so powerful that it ...
3
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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
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2answers
848 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 ...
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3answers
27k 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 ...
3
votes
1answer
727 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 ...
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2answers
2k 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
314 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
1answer
1k 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. ...
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1answer
1k 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
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1answer
455 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
1answer
149 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 ...
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4answers
3k 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 ...
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4answers
413 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?
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6answers
7k 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
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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 ...
2
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2answers
3k views

Does turning the air conditioning on and skipping its “fan” setting damage the air conditioner?

Air conditioning units nowadays allow you to switch it from "off" to various levels of "cool" without requiring you to "fan" setting first. Is there any reason to use "fan" setting (such as for ...
2
votes
1answer
3k 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 ...
2
votes
1answer
114 views

AC comes on randomly

Even though my thermostat was set to "Off" or "Heat", my air conditioner is coming on randomly and blowing cold air out of the vents. I figured that the thermostat was bad so I disconnected all of ...
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3answers
131 views

Can I cool 540 sq. ft. with a single A/C unit?

I have a small apartment - about 540sq ft. The layout: Click for larger view The red square would be the internal unit, and to the left and right I have 2 rooms. I also have a 6 month old ...
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1answer
1k views

Why isn't my heat pump system kicking out cool air this year?

I have a Carrier heat pump/air handler system (looks pretty old) with a honeywell T-stat (looks pretty new) and I am not getting cool air. Heat worked all winter, but I have used it in at least a ...
2
votes
1answer
1k views

How can I reduce heat transfer around my window unit air conditioners?

I have three old window units in my house and they function as my A/C. I am concerned about the amount of heat seeping into the house and cool air leaking out around the A/C units themselves. They're ...
2
votes
1answer
4k views

Why is there water dripping from my ceiling AC vents?

I have a one story house with hot water heat. The house also has forced air AC ducts running from the attached garage, in the attic, down into the living room, bedrooms, and kitchen. At certain times ...
2
votes
3answers
4k views

If my air conditioner return line iced over and the fan stopped, is it broken?

We've lived in our house for three summers and have never had any problems with the air conditioner. Today I noticed that there was ice on the coolant return line outside the house. I didn't think ...
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2answers
1k views

How do I clean an AC condensate pan?

I have a Ducane HVAC system that started leaking out of the evaporator coil housing. Mine looks like the EU1P. I read that i need to clean out the drip pan. II tried cleaning it by sucking out the ...
2
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2answers
200 views

How can I prevent my clothes dryer door from fogging up?

When I turn the air conditioning on in my house, the inside of the window in the clothes dryer door fogs up. Also, if clothes are left in the dryer, they become slightly damp again. How can I prevent ...
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2answers
345 views

How can I add ventilation to my room?

My room is 3×5 meters, it doesn't have a ventilation pipe connected to it, so the air becomes close very fast, and to freshen up the room I have to open the window, and it makes my room very cold. ...
2
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2answers
3k views

Why is my A/C unit running when the heater runs?

So it finally got cold here in AZ. We switched our thermostat from A/C to Heat. Now for some reason when the electric heater runs, the A/C condenser unit outside kicks on too. This is our first winter ...
2
votes
1answer
7k 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 ...
2
votes
3answers
2k views

How can I improve hvac air flow to my attic?

Two years ago I converted the attic of my 1.5 story house into a livable space. It had no HVAC ducts going up, so I ran some coming from the basement where the furnace is. Air flow to the attic via ...
2
votes
1answer
436 views

How can I extend this concrete pad?

So the wedge shaped concrete pad thats right up against the house; April 17th, we're having air conditioning installed before it gets to hot out. According to the installer, the unit will fit on the ...
2
votes
1answer
142 views

When I set the thermostat to X degrees, is that the temperature at which air is pushed out through the vents?

My hunch is that most ac units aren't that sophisticated, and they just pump air that is "cold enough" or "hot enough" and pump it until temperature rises to the specified value. Is that right?
2
votes
1answer
1k views

Is it normal for A/C performance to improve when vent covers are removed?

I recently moved my office to the second floor of our home and I haven't been able to get the temperature below about 78 even though the thermostat is on 72. My son's bedroom had been the same way ...
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votes
4answers
1k views

How long does it take to make money back on a new air conditioner?

I have a townhouse built in 1975 with an air conditioner on the roof. I have no idea how old it is but I can imagine it is on it's last legs. What's more, this last month's energy bill was one of our ...
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2answers
507 views

What is a safe maximum temperature for an unused part of the house?

We barely use our upstairs so I don't really care how hot it gets. Except, I don't want to cause damage to the house. Considering Texas summers are easily in the 110s °F nowadays, how high can I ...
2
votes
2answers
907 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?
2
votes
1answer
289 views

What is involved in sizing and designing ducts and ductwork?

I have a one-story house, and it looks like it would be easy to run new ducts myself in the attic. What should I know before trying to design a duct system myself? I have seen ductwork that's metal ...
2
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4answers
6k 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 ...
2
votes
1answer
168 views

How do I properly size an air conditioner for a very sunny room?

I'm trying to size a window air conditioner for a room, but having trouble deciding if the usual guidelines are a good fit. The room in question is about 230 sq. feet, and does not have full 8 foot ...