Questions tagged [air-conditioning]

For general questions regarding cooling your home.

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75 views

Why is the paint around my ceiling air vent discolored?

What is this pattern of discoloration around my ceiling AC supply vent, and how can I stop it from happening again if I repaint? Background: In September 2016, I had an air conditioning system ...
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1answer
37 views

Honeywell T6 PRO Z-Wave Thermostat (model th6320zw2003) exhibits very erratic behavior after battery replacement

Background: My apartment complex installed Honeywell model th6320zw2003 thermostats in all units about six months or so ago, and it had been working well for all that time. The only issue was that ...
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4answers
102 views

AC air feels unnatural

I have a general question concerning air condition systems. Basically to me the air coming out of the AC unit doesn't feel natural. I've experienced different types of AC units, from small to quite ...
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1answer
34 views

AC Compressor was not turning off

With a split unit aircon unit the compressor and fan would keep running even when the unit inside was turned off. I figured out it was probably the relay sticking, so I replaced it on the control ...
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1answer
37 views

Furnace relay - old one says 18 LRA, replacement says 48 LRA - Does it matter?

forgive me if this is a newbie question. I am replacing a relay inside an electrical furnace/air handler. It is a relay model 90-293Q. The original one I have specifies it as "8 FLA, 18 LRA" but the ...
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2answers
61 views

Heat pump not working after rain

A couple weeks ago, I had a Goodman 3 ton heat pump split system put in. At 5pm hours today, I was outside near the heat pump and noticed that it was functioning properly. At about 6pm, there was a ...
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3answers
60 views

Powering a Window Air Conditioner — 10' 12/3 SJTW extension cord vs new outlet?

TL;DR: Is it fine to use 10' 12/3 extension cord or should I really have an electrician come out & install a new outlet? I recently installed 8,000 BTU window air conditioner (the LG LW8016ER). ...
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0answers
65 views

Why is my HVAC system not turning on the A/C compressor?

My AC stop cooling. Here's what I found. Inside blower is working, outside compressor/fan does not turn on. I manually push the contacts in the outside relay and the compressor and fan worked, used ...
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2answers
63 views

How to investigate a problem with blown 50 amp HVAC fuse without power?

My AC unit has the fan working but not the condenser and I found that one of the two 50 amp fuses was bad. Unfortunately after replacing it, I saw and heard a spark and the new fuse was blown ...
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2answers
39 views

Forced air furnace filter gets wet with water while A/C is ON

Noticed lately when it has been extremely hot, and my air conditioner is constantly turned on, that my furnace filter get soaked wet. Took it out , opened the furnace door to check, but there was no ...
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3answers
76 views

Portable AC not getting ride of condensate

I have a portable AC (LG lp1015wnr) which does not evaporate the condensate. It doesn't matter if it is in Dry or Cool mode. In both modes the water is drained from the drain pipe at the same rate. --...
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3answers
44 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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4answers
59 views

What parameters affect the amount of btu required to cool a single room

Background Due to the reason I lack knowledge in air conditioning I asked a company that manufactures and sells a\cs to send a consultant to advise me on which air conditioner I should use in my room....
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1answer
1k views

What causes burn marks on the air handler in the attic?

What caused these burn marks? Phoenix Arizona suburb. House was construction complete about 6 months ago. The tape and insulating foam around the bigger tube was cut. I assume the AC tech that ...
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5answers
153 views

AC is dead, should we open the windows to release the heat and humidity?

Live in Central Texas where the temp is in the upper 90's, low 100's. My AC went so I had to put a single room AC unit for my Master bedroom and bath. Square footage for coverage is 600 sq. feet. Well,...
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1answer
44 views

Loud noise from outdoor unit several seconds after AC turns off

I haven't been able to find anyone online with quite this issue... I have a Carrier heat pump system, and through the winter it would often make that torpedo noise when heating the house (I later ...
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1answer
38 views

Add common wire to furnace

Trying to add common wire to furnace for smart thermostat. Looking at wiring diagram, it looks like common wire off transformer is blue, switches wire color to white (via wire cap), then back to blue (...
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2answers
80 views

Heating pool with excess AC heat

Unfortunately our new outdoor AC unit – a usual with a fan and aluminium heat exchanger – does not contain plugs to a water heat exchanger. That's a pity as the waste heat in summer could be used to ...
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1answer
33 views

Ac wires/dog help

My dog was messing around the ac unit outside. Two wires red and white that are still attached to the ac unit are now hanging and I do not know where they attach to, any one have an idea?
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1answer
98 views

My swamp cooler is leaving everything in the house black, why?

It's a brand new swamp cooler. I've called the landlord twice to fix it he said the belt fell off the first time then the second time he said there's nothing is wrong. It's the same problem from ...
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1answer
47 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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1answer
77 views

Return plenum too big for air handler?

I am currently in the process of changing the air handler and heat pump in my house. I am working with a friend's father who does HVAC for a living. He came over and looked at my HVAC system and gave ...
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0answers
43 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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4answers
67 views

Portable air vent

Can I vent a portable air conditioner thru a wall sleeve? Will it vent properly? I have no air conditioning and don't want to spend a ton on a in wall air conditioner..
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1answer
46 views

Window AC fan drip pan full

My AC started to blow out pretty lukewarm air recently, as well as make watery sounds while running. I realized the filter was dirty, and I cleaned the coils, replaced the filter and removed lots of ...
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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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1answer
47 views

Is the PY4G HVAC unit compatible with Nest Thermostat?

I recently bought a Nest Thermostat and I've had nothing but trouble with it. The main symptom is the fan and the AC compressor won't run at the same time. Power only comes through the green wire, not ...
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1answer
65 views

How to fill large window gap for temporary air conditioner?

I have an air conditioner that looks similar to this... ...except mine doesn't have the flaps on the sides, leaving a large open gap between the air conditioner and the window frame. What's the best ...
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1answer
68 views

Why does my thermostat show code 'PF' after running the fan or A/C?

After running either just the central HVAC fan, or the central HVAC AC for just a few minutes, the Bryant thermostat (Model TSTATBBPB101, C Wire attached) screen momentarily shows "PF", and then goes ...
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2answers
28 views

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 ...
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1answer
176 views

How long should I wait before turning on a window AC after moving it?

So my downstairs AC went, of course during this insane heat wave. Checked out Lowes and found a small room AC for 150$ so came up with a plan. My room AC is rated for a much bigger space so I bought ...
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0answers
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 ...
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1answer
39 views

External Air Conditioner Condenser Capacitor replacement

I have a couple of questions about testing and replacing the capacitor on my home heat pump external condenser unit. 1. How can I reliably test the capacitor (what tools do I need?) 2. What safety ...
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1answer
56 views

Is it more efficient to turn my AC unit off periodically vs. keeping it on only while in the room?

I have an AC unit in my bedroom + workspace. I use its "auto" fan speed and "energy saver" mode (rather than "cool" or "fan only"). I'm wondering, which strategy is more energy efficient and by ...
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1answer
42 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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1answer
33 views

Could my furnace be leaking due to condensation neutralizer?

I posted this and the main suspect was condensation pump but after troubleshooting, the pump is working fine (tested standalone). Now I wonder if the leak could be due to the condensation neutralizer; ...
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2answers
52 views

My outside a/c unit will not kick on

Earlier today the a/c unit tripped the breaker. I reset the breaker but the outside unit will not kick on. Please advise.
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1answer
51 views

Can I add return air vents to improve air conditioning in some rooms?

The return air system in my 46 yo home utilizes the stud space not a duct system. My bedroom has a vent and maintains a temp about 5 to 10 degrees lower than the other bedrooms. My question: Can I ...
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0answers
79 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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1answer
131 views

NEMA 6-15 to NEMA 6-20 A/C unit

My energy provider sent me a WiFi A/C system to hook up to my window unit, however, I cannot plug it into my wall because I appear to have a NEMA 6-15 outlet that matches the plug on my A/C unit and ...
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0answers
23 views

domestic air condition needs restart for cool air

I have a new domestic air condition 9000btu in my room. I have the settings cool and 23 degree temperature and I noticed that when I turned it on for the first time of the day, it doesn't blow cool ...
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3answers
166 views

How can I keep my computers cool in a 100 degree house?

I live in a tiny house of sorts and my AC doesn't run while I'm not there. I have two desktop servers that I use for my work which are currently stored elsewhere, but I'd really like to move them to ...
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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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1answer
41 views

Running AC/Heater when washing a cleanable filter

I have a heat pump/AC system with a washable air filter. I was told to clean the filter out and run water through it once a month. He told me to let the filter dry for 3 hours before replacing it. I ...
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2answers
422 views

Can combing bent evaporator coil fins damage it?

I have recently purchased a new AC. I opened it to clean air filters and found that an entire row of fins were bent. I asked the manufacturer about this and they said that it won't affect the ...
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3answers
160 views

Is there such a thing as a DIY heat pump or mini split

I wanted to ask this question to the community. Is there a legal way to install a mini split or heat pump without having an EPA license? I have seen similar questions asked several times or ...
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1answer
42 views

The top A/C drain in my attic is leaking. Why?

My dad told me that the top A/C drain (we have bottom and top A/C drains) was leaking, and he wanted me to find out why it is happening. Our A/C system is from Ruud. So what is causing the the top ...
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1answer
64 views

Choosing air-conditioner's BTU power for humidity

Recently, I've been cut off of access to sun and fresh air to my apartment. It is completely sealed now, with no windows or sun to the walls or roof. Ever since, humidity has grown a lot, and mold is ...
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0answers
107 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
41 views

AC Condensate Line Location - Outside vs Inside

I'm installing a few mini-split AC units in my house, and I'm trying to determine the best place to run the condensate line. Right now it's either between running it outside with the line set and tray ...