For general questions regarding cooling your home.

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6answers
36k views

Why does my Central A/C Keeps Blowing its Fuse?

For years, my A/C condensing unit has blown a fuse once, maybe twice a year. It's 27 years old now and blew a few fuses last spring. Now it blows a fuse every few days. So, I replaced a bad running ...
3
votes
4answers
11k 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% ...
1
vote
1answer
189 views

Chattering contactor, what should voltage be when AC is on/off?

I have a Nest thermostat that I believe is the culprit of this issue. I've already replaced the contactor once and now the new one is chattering and not kicking the AC on. When the AC is turned off, ...
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0answers
50 views

Mini Split condensate pump to condensate drain

I'm working out the details of my Mini split. I know by code I have to have it connected to a 3/4" condensate line going outside. The Mini Split's air handler is located on an inside room where I'm ...
0
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1answer
131 views

What is the rated power of American central air-conditioning control circuit?

I want to know what is the rated power that American central air-conditioning 24V control circuit can supply, which is also the power supply for Nest. Nest gets its power from the 24V control ...
1
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1answer
492 views

Why would a blower motor work with A/C, but burn out with furnace?

I've gone through 2 blower motors since I purchased the home 3 yrs ago. I never have an issue with the blower when the AC runs; but it keeps dying in the winter with the furnace. I've had 2 HVAC ...
0
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1answer
172 views

noisy Air-conditioner compressor

I bought a new split AC that worked great for a week or so, but now I can hear some annoying noise coming from the outdoor unit. The outdoor unit in installed on a flat roof so I can hear this noise ...
7
votes
5answers
42k views

What are the recommended settings for a dual-zone air conditioning unit?

What are the recommended settings for an air conditioning unit that is dual-zone? Meaning, if I have a house that is two stories I know that in Florida they recommend you keep it at 78 F in the summer ...
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2answers
96 views

Is heating feature in an air conditioner bad?

I was looking to buy an air conditioner (split system), recently and a local dealer told to go for ACs with cooling feature only and not ACs with heating feature, as they require more servicing and ...
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2answers
152 views

How do I properly size a 120v inline power relay to control a small air conditioner with my home automation system?

I have a 5,000 BTU, 115 volt, 4.8 amp, window-unit air conditioner I'd like to control from my home automation system. I think easiest thing to do would be to plug the unit into an inline rely module ...
1
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1answer
108 views

Is this 230v motor wired for 115v operation

I have the following wiring diagram for the motor I am replacing. After looking at the wiring as shown here, I see one black and one purple wired to the terminals. There is a second set that is ...
1
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1answer
58 views

Can I vent a portable airco exhaust in the wall cavity?

I'm renting an appartment in a small appartment block, which got very hot last summer, and very moist in winter when hanging our laundry. The obvious solution would be to place a protable airco unit,...
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2answers
232 views

HVAC unit won't come on

This morning I noticed that my main floor wasn't cooling. I found the condensation pump full ( little giant model VCMA-15ULS ). I disconnected the hose from the unit to the pump, drained it, dumped ...
2
votes
3answers
2k views

All outlets on one 15-amp circuit, need AC unit

The central AC in our apartment is not working effectively in the summer; we are running the AC continuously for 14 hours a day to keep the temperature below 80 degrees. As you can imagine, our ...
0
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1answer
114 views

Installing a window unit in a metal window frame with two raised lips

I have a window that has a metal frame with two raised lips. All the diagrams in the installation manual show only one raised lip. The problem is that the bottom frame of the window unit that is ...
1
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1answer
441 views

heat pump/air conditioning wiring to thermostat

We decided to change the thermostat of our heat pump/air conditionnning unit. First 3 images are the old unit. The first 3 wires(1 and 2 picture) yellow red orange were not connected to anything, just ...
0
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1answer
472 views

Does an outdoor AC condenser unit (Heat Pump) require lubrication? Pic included

I have been in my house for 11 years now and every 3 or 4 years I have been taking the lid off my condenser unit and lubricating it. I just don’t know if I am even supposed to do this, but it make ...
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2answers
1k views

Can I convert a window A/C unit in to a pool-water cooled system?

I have an 18,000 BTU A/C unit that blew a compressor last year. Perfect for a small project. I however could not find a professional to help me out, so maybe it's DIYable. I know just about enough ...
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0answers
28 views

How to connect 4 fan coils with one wall control thermostat?

I have 4 fan coils (Sabiana sk-22)and I want to connect them with one wall control thermostat. How can I do?
1
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3answers
2k views

Is there a filter-reminder thermostat that uses run-time instead of total time?

My HVAC filter is in my crawlspace and is a hassle to change. I don't want to change it more than needed. "Change it every month" is bogus advice because in some months (like May) we don't have to run ...
4
votes
3answers
427 views

90% Humididty @ 23 Celsius direct from Air Conditioning Outlet

I have a mold problem in my apartment, in certain areas there is condensation. I believe I have traced this to the air conditioning, in the apartment the humidity will vary from 60% to 85% RH at a ...
0
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0answers
26 views

size of communication cable of the central ac as per tonnage

i want to know the communication Cable Size As per the tonnage of the centralised ac as per the standard ac rules & Regulations
2
votes
1answer
880 views

Air conditioning unit sitting on the ground

We've lived in our house 11 years. Our air conditioning (condenser) unit, the big boxy thing sitting outside, is not sitting on a concrete slab. It's just sitting on the ground and we noticed this ...
2
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1answer
65 views

Should I try to repair an A/C condensate pump that has suddenly started getting real noisy?

So my Little Giant Condensate pump suddenly started getting real noisy when it kicked on. I pulled the cap off the unit and the water sure is dirty in there. I have done nothing with the unit in the ...
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1answer
66 views

How to remove old A/C piping in my house?

When I had my new A/C installed I moved it to the other side of my house (right next to the furnace), so now I have a bunch of old copper piping running about 30 feet from one corner of my house to ...
4
votes
2answers
141 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 ...
1
vote
2answers
334 views

Can I pump down an Air Conditioner myself?

We are planning on having a new concrete patio poured in a couple of weeks and need to move our AC unit to make way for the slab. Is it possible for a layman to pump down the coolant and move the ...
4
votes
7answers
67k views

Should I insulate air conditioner coolant pipes?

I recently replaced some rotted insulation on the coolant pipe that runs out of my AC unit and into the evaporator in my house. When cleaning inside the actual AC unit itself I noticed that the ...
2
votes
1answer
116 views

Is infrared blocking film effective in reducing temperature inside a room?

I was going to put a foil on windows, but found a film that is alleged to reflect rays from infrared spectrum, thus preventing 60% of sun heat of entering a room. Any criticism on it? Or personal ...
3
votes
11answers
9k 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 ...
1
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4answers
131 views

Why is humidity high from one unit but not the other?

Two months ago, I posted about our upstairs a/c not cooling all of a sudden. I ended up replacing the capacitor for the blower fan and the contactor, which did the trick. AC cools!!! However since ...
0
votes
1answer
110 views

Can the back side of a window type aircon exhaust in an empty ceiling area?

I'm planning use a window type A/C on my little attic room. My A/C unit is just .5 HP, just enough for the small room. The problem is there's no proper exhaust area like the standard Window type. ...
2
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1answer
57 views

Air conditioned made a sound while running and stopped working

Air conditioned made a sound while running and stopped working,I guess its probably short circuited.How can I repair it by myself? What all tools do I need?
2
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4answers
3k views

Can a homeowner without a Section 608 EPA license legally connect his own gauges to his own air conditioner if the unit uses 410a refrigerant?

It has been suggested by at least one moderator on this site that EPA Section 608, which restricts who can purchase and handle refrigerant, including who can connect a set of manifold gauges to a unit,...
0
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1answer
396 views

Split AC installation: Need for a Vacuum Pump & Nitrogen cylinder

I bought a new Split AC (1 ton, LG made) and the company sent home a technician to install the unit. The guy arrived and took measurements and I quizzed him a bit about his kit and strangely it doesn'...
2
votes
2answers
10k views

AC unit won't turn on: both inside blower fan and outside fan unit won't turn on

AC unit won't turn on: both inside blower fan and outside fan unit won't turn on. It is as if I had gone to the circuit breaker and cut the power to the whole HVAC system, but I didn't. I've been ...
1
vote
1answer
80 views

What is causing this air-conditioning unit to cool on cold days?

This is a temperature log from a reverse cycle air conditioning system that has run fine for getting on for 30 years. It has suddenly started to blast out cold air on days when it should be heating. ...
3
votes
2answers
7k 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. ...
4
votes
2answers
2k 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 ...
1
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2answers
228 views

How can I replace an air conditioning thermostat?

I have ducted air conditioner with a control panel in both bedrooms and the living area that only has a thermostat. Is it possible to replace each of these easily (and inexpensively) with a timer to ...
9
votes
2answers
7k views

How can I further diagnose my central air conditioning compressor fan motor and capacitor?

I have a 15 year old Bryant Central Air unit in my house. Yesterday it stopped working. Here is what I have checked. The breaker in the basement is not tripped. The furnace works fine from the ...
1
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1answer
133 views

Extending Length of Air Conditioning Drain Pipe

I live in a multi apartment building. All the neighbors has AC. Many AC's has condensation drainage pipes which descent into the common garden and are cut at about two meters above ground. Others are ...
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vote
2answers
7k views

Air handler condensation draining problem

For the life of me, I cannot figure this out. My air handler and heat pump were installed in 2006 and work great. For the first summer since I've owned the home, condensation started to not drain ...
0
votes
1answer
54 views

Should there be a cap next to my furnace ac drain?

In the picture below, the left side has a good amount of airflow while the ac/blower is running. The tube on the right is the drain that the condensation flows out of to the floor. Should there be a ...
2
votes
4answers
18k views

How can I calculate the power consumption of an A/C unit?

I have an AC unit with the following specs: Cooling Capacity: 1260 kcal/h, 1.47kW, 5000 Btu/h Fan Motor Power: 0.034 kW Current: 0.155 A My question is how much power does this unit actually ...
8
votes
2answers
3k views

Why do my lights dim, when my neighbor's central AC turns on?

I understand that the lights would dim with a dryer or large AC on my own circuit system, but is it normal for that to happen when my neighbor's central AC turns on? I validated the timing (hearing ...
0
votes
0answers
63 views

Will a modern AC automatically switch between cooling and heating?

Say I set the temp to 23C on a hot day but the weather turns cold eventually. Will it detect later that autumn came and heating is needed? I'm talking about a Panasonic inverter AC.
0
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0answers
86 views

Older home with no AC plenum…replace our entire AC system as suggested?

We have an older home that has a large living-area/fireplace room; the AC unit sits over it in the attic. Earlier this year, in that room, we noticed a crack beginning to form in the ceiling sheet ...
0
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1answer
96 views

Should I add a return or another supply to a large room with only one supply?

I just moved into a new house and I have that one room that always seems to be hot. It's on the 2nd floor of the house with the attic over it. The other 2 rooms on the 2nd floor are always a nice ...
1
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1answer
81 views

Can using a new evap coil on top of an older furnace cause problems?

I am getting quotes for a new R410A condenser unit/evaporator coil from several HVAC contractors. A salesperson refused to give me a quote unless I purchase a new furnace as well. He said that he has ...