Questions tagged [air-conditioning]

For general questions regarding cooling your home.

118 questions with no upvoted or accepted answers
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Thermostat settings two hvac units older house

So I purchased a historic house built in 1920. The house has two HVAC units, one for the upper floor, one for the lower. Total sq ft 3300. I had been setting the upstairs thermostat at about 83 ...
3
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2answers
242 views

A/C unit cycles on and off

My outside compressor / condenser is cycling on and off, even though the thermostat is calling for A/C. The blower in the house still runs, and the thermostat is working properly. (I opened up the ...
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0answers
34 views

Thermostat wiring for ac

I recently installed a nest thermostat for our AC system. Unfortunately I was short sighted and just assumed all the wires were the color I needed. Since installing the thermostat our system won’t ...
2
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1answer
64 views

Solar panel as a hatch and Is sleeping under a solar panel safe?

I'm looking to build a very large custom roof hatch/vent on my van. I was going to make to top out of Lexan, but then I realized I might want a large solar panel on the roof as well. I was looking at ...
2
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1answer
199 views

AC Blower Motor not working during night

The blower motor in the furnace stops working at night most of the time when the AC should be on. The blower motor (in the furnace) might run for one or two cycles at the beginning of the night but ...
2
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2answers
101 views

I have a Janitrol Model A42-15 and I wanti to replace the outside unit, but it takes the dreaded R22

Can you use the new refrigerant with the existing inside unit? If so, what would be units that are compatible with my existing one? My outside unit is a 3.5 ton unit, but I am going to need a 4 ton ...
2
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2answers
126 views

Air conditioner problems

My A/C is having problems for the last few days. My outside unit which the main motor is always cycling off and on every 3-5 minutes and the room temperature is not improving. This happens even when ...
2
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0answers
69 views

Air handler for an AC in the attic collect about 1 cm of water in it before it is high enough to drain… problem?

My air handler in my attic won't drain water(because the hole is 1cm above the pan) until the water reaches that hole. Why is this setup this way. From what I have read, NO water should be in the ...
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0answers
2k views

Why does my outdoor AC unit make a screeching sound when it shuts off?

MY AC cools just fine. But when it cuts off, the loud screeching sound outside can be heard from far away. This only happens when the AC goes off. There are no other weird sounds, any other time. ...
2
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1answer
742 views

How to install a 4-wire a/c & fan thermostat with only 3 wires

My home currently has a central a/c unit which is controlled from an 3-wire old mercury switch thermostat. I want to replace it with a newer Honeywell that requires 4 wires. The existing thermostat ...
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0answers
570 views

How can I insulate and elevate an A/C line set on a flat rubber roof?

The Scenario An apartment building with a flat black rubber roof. The A/C condenser is on a platform on the roof with an air handler inside the unit. The line set runs across the roof for about 20 ...
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1answer
110 views

New thermostat: How to wire it?

My old air conditioner thermostat broke down, so I bought a new one. But when it arrived, I was horrified to discover that the terminal of the wires were not named the same. Both thermostats have ...
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1answer
32 views

HVAC Air Blowback

Furnace/Blower: Rheem R92PA0851521MSA Dual Zone System (Honeywell TrueZONE HZ311) - Honeywell M847D1004 Actuators Age of system: less than 2 years old including ductwork Ive noticed that if Zone 1 ...
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0answers
77 views

The new AC doesn't cool the house down like old unit, what can be the problem?

I had to replace my old HVAC because it was old and had a freon leak. The new unit doesn't cool down the house like the old system. The ac runs all day and it takes hours to get down to 72 degrees and ...
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0answers
34 views

Furnace blower cutting in and out during A/C use

Backstory: I fired up my air condition for the first time this season (single family house) and felt lukewarm air coming out of my ducts. When i went outside i saw that the condenser was not turning ...
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0answers
52 views

Does cabling between a mini-split indoor and outdoor unit need conduit?

I am installing a mini-split AC system where there are multiple indoor units connected to a single outdoor unit. For each indoor unit, there is a separate 4-conductor cable that connects to the ...
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1answer
46 views

Maximum weight window air condition without supports?

For the average old window what is the maximum weight air condition you should have installed without any support brackets beside screwing in the window frame from the inside? For example up to 50 ...
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1answer
53 views

Line to AC dripping at the furnace

My line from my exterior AC unit is dripping at the furnace. The dripping over time has caused rusting and we've had to replace the control board under it. It appears the root cause of the problem ...
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0answers
61 views

Fujitsu Halcyon: Custom Air-Filter (C.F.M.)

I'm trying to make airfilters to fit over my Fujitsu Halcyon Wall Mounted heating & air-conditioning split system. I'm talking about the indoor unit specifically. The wire mesh screens that come ...
1
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1answer
36 views

Hook up new thermostat

Top brown picture is my old thermostat white is the new one , do I have it wired correct? On out side unit we have replaced motor, fuses, compassator ,cc contactor ,relay . We have a heat pump. But ...
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0answers
59 views

Controlling one FCU with two thermostats

I have a chilled water fan coil unit that will feed two areas, living and the bedroom. I want to control the FCU with two thermostats, one in the living and one in the bedroom, (preferably) in a ...
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2answers
47 views

Circuit board fuse for the air handler

where in the furnace does it say if it uses a 3 amp or 5 amp fuse for the circuit board? Or how would I know which is correct
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1answer
45 views

Fan comes on but the air conditioner does not

During hot days when the air conditioner is on a lot it comes to a point in the evening when the air conditioner shuts down and the fan (from furnace) stays on. This will go on all night as the house ...
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0answers
2k views

Carrier Infinity System says “System Malfunction”

On this, the day temperatures reached 95, my AC stopped working. Here are the symptoms: The thermostat says "Infinity System - System Malfunction Call Technician". The condenser outside is spinning, ...
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1answer
74 views

Air conditioning thermostat wiring help

Really need some help. I was working on the wiring of my home air conditioning and managed to mess up the low voltage wiring. I was installing a wifi thermostat and opened the panel to add a blue ...
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2answers
216 views

Condensate drain does not drain properly

My air handler is located in the garage and for some reason it will not drain properly until the fan shuts off.Unfortunately I cannot figure out how to add a photo but it has a vent pipe coming out of ...
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1answer
50 views

Why compressor of my Air Conditioner is not working?

Compressor of my AC is not working . My AC is Window type , in window type AC compressor starts if the room become hot then it stops when the room become cold . But today compressor of AC was not ...
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0answers
1k views

How would I install a window AC on an awning window?

My house I'm renting was unfortunately made with awning windows. The window I want to place a window AC is a single pane large awning window that winds out. I certainly do not want to go with a ...
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0answers
49 views

Is this wood the source of the odor?

I moved into a 425 sq ft apartment about a month ago. The AC had a leak for awhile. When I found it, they replaced the AC. I have had the new AC for about 2 weeks. I have a musky old wood odor in my ...
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0answers
1k views

AC Can't keep up with Set Point

After looking here A/C not keeping up and also here Air Conditioner Can't Keep up . I have decided to ask a question that perhaps someone can provide me with more insight. My AC unit was doing ...
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2answers
92 views

Air Conditioning and blower problems

Ok, the blower unit will run on heat and fan on. However when I switch to auto and cool the blower unit doesn't run. When I have the blower in the "on" position it will run until I switch the ...
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0answers
38 views

Sun control film selection or my bedroom to reduce AC heat load

I have a West facing room with large glass windows (approx. 30 sq ft) in a tropical nation. The summer sun heats up the room considerably. I was thinking of applying sun control film to the windows ...
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0answers
523 views

Replaced HVAC Transformer, still have no output voltage

My HVAC stopped working, no matter what state the thermostat is in there is no fan, no compressor, no heat, etc. Using a multimeter, I found that the output voltage on the transformer was 0V. ...
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458 views

AC fan and Compressor not cycling properly and turning off

AC was not cooling and out side unit fan was turing on intermittently, install the new capicitor, problem stays same, fan and compressor ran, fan stop befor ecompressor, compressor run little longer ...
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0answers
2k views

AC capacitor testing with multimeter

When running through my check list to start the AC for the spring/summer I noticed the outdoor fan was not running, hence no cooling. I'm using a basic digital multimeter to test a capacitor with the ...
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0answers
96 views

Proper A/C BTUs for Apartment

According to this energystar.gov chart, the proper air conditioning BTU capacity for a 500 square foot room is 12,000 BTUs. However, since this is an apartment divided up into several rooms with the ...
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0answers
45 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?
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0answers
39 views

Re-locating a split system A/C to a different room

I currently have a split system A/C unit in our living room that is really too small for the room. It runs full blast when it's turned on and whilst it does work at cooling the room, it's not ...
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0answers
79 views

How do I maximize light gain and minimize heat gain for my glass wall?

How to get maximum benefit of daylight while optimizing air-conditioner benefit for a glass wall (currently) of size 11' * 8' (total 88 square feet exposed). Facts: The glass wall never gets direct ...
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0answers
119 views

Why doesn't my A/C get power when using the alternate C-wire thermostat hook-up method?

I changed my old Honeywell thermostat for a new Honeywell WiFi thermostat. I installed it just as the directions stated. I used the alternate C-wire method as the old unit did not have one. ...
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0answers
327 views

What type of air conditioner to look for

I'm looking for a portable air conditioner that can be moved from room to room. But the key thing I want is one that does not use a condensation tank. I know they exist because I have seen one. It ...
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0answers
558 views

Where to buy plastic (temporary) air ducting in the UK?

Does anyone know somewhere (ideally online) I can buy plastic air ducting? The stuff I'm talking about is what they used on Mythbusters to make that helium 'airship'. It's just a large diameter tube ...
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2answers
2k views

Why might a thermostat refuse to switch from Heat mode to Cool mode?

I have this Honeywell RTHL2410C programmable thermostat and typical Florida electric AC system. Starting this Spring, it has started behaving strangely when switching from Heat to Cool mode. The ...
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1answer
87 views

What cleaners are there in the market to use for Air duct duct cleaning?

My air ducts need to be cleaned: My house is near to the mountains so I' am unable to get a duct cleaning company to come to my house. Can any body suggest me some cleaners used for air duct cleaning?...
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1answer
609 views

Why did this AC with a shared condenser stop working?

We've got 3 indoor air-con units that are connected to 1 outdoor condenser unit. Only my unit blows air in room temperature (not cold), the rest of the indoor units blow cold air. My indoor unit blows ...
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2answers
24 views

Fan is turning on air conditioner but no air movement

A few weeks ago I changed the outside unit's starting capacitor and that got the fan on that unit to rotate and the air conditioning on the enclosed back porch started working. Today I came home and ...
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1answer
20 views

Carrier model furnace inducer motor turns on and off briefly

I have a carrier model furnace where the inducer motor will turn on for approximately 10 seconds then shut off for a minute or so. It only recently started doing this and it only does it my ...
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0answers
37 views

Split unit Air Conditioner replace compressor single to three phase

I have a 3-ton split AC "single-phase compressor" was working perfectly until I moved it to another location, some oil spilled from the suction pipe during the transportation so when I installed it in ...
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0answers
24 views

A/C - Repeated Freon Leaks & Run Capacitators/Fan failures

My senior citizen father has a home warranty policy. Different contractors have worked on the A/C every year since 2011. He services it in the spring and changes the filter regularly, but we live in ...
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14 views

How to apply drain cleaner to A/C drain

A while back I asked a question in a thread (The top A/C drain in my attic is leaking. Why?), and I wanted to know how to apply drain cleaner to the bottom drain on my A/C system. Could someone answer ...