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2 votes

My thermostat is stuck on the on mode.What do I do?It won't go to the auto mode and the fan thing

It is possible the thermostat slide switch for on/off/auto is broken or frozen in place. You may need to replace the thermostat. Get a new thermostat before attempting to force the slide switch as ...
ArchonOSX's user avatar
  • 20.2k
2 votes

Confirming correct wiring on replacement AC contactor

Yes ... The layout doesn't matter, so long as the new contactor fits, and can be mounted physically, so that the wires can reach their respective contacts. You must follow the documentation of the new ...
jay613's user avatar
  • 41.7k
7 votes

Is it a good idea to buy a used HVAC? if do, what should I know

Summary: the cost of moving it, plus the 6 year reduction in service life through which you ammortize the labor charges, plus the lack of any warranty, make this a bad idea. Don't do it. Get two or ...
jay613's user avatar
  • 41.7k
1 vote

Confirming correct wiring on replacement AC contactor

I would replace the old one and connect the wires to the new one in exactly the same pattern. Make sure your wire from the capacitor has the same continuity to the left side terminal you described in ...
ArchonOSX's user avatar
  • 20.2k
1 vote

Time delay or contactor bad?

This is a common problem with relays that causes buzzing or chattering. When the contacts become carboned up or pitted after many cycles the relay begins to chatter and will not hold. If the relay is ...
ArchonOSX's user avatar
  • 20.2k
0 votes

How can we prevent the upper floor in a split-level home from getting too warm?

Consider getting a wireless thermostat which moves up/down stairs depending on either the time of day or the time of year. This is the cheapest and easiest option. These days you could use a wireless ...
Ram's user avatar
  • 267
0 votes

How can we prevent the upper floor in a split-level home from getting too warm?

Options I've considered for my system, which is two floors with open stairwell and minisplit heads on both floors: Reduce air circulation between the floors. May require new doors or walls. In my ...
keshlam's user avatar
  • 30.8k
0 votes

How can we prevent the upper floor in a split-level home from getting too warm?

There's multiple options for keeping the top floor cool. If you can, it may be worth it to look into a separate AC zone for the top level, though this is energy intensive. Window AC units could be ...
Aristocratic Jack's user avatar
0 votes

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

I have a right to left aluminum sliding window and a huge old AC. I use a full sheet of construction foam board ($45 a sheet). I cut the sheet to the overall size of the window and then cut out the ...
Bean's user avatar
  • 1
2 votes
Accepted

How can I unclog a continuous drain in a portable air conditioner?

Some repeat vacuuming of both regular and continuous drain openings helped to fix the continuous drain feature. Perhaps, injecting vinegar also contributed. This particular unit also requires a little ...
Serge's user avatar
  • 153
0 votes

Air not cooling whole house

Call a tech to looks at ducts and clean the system? If you just had construction done, cleaning the system is probably a good idea (to clean out the dust from the construction). I would tend to do ...
mdfst13's user avatar
  • 503
0 votes

Nitrogen test not finding leak in HVAC system after all refrigerant leaked out

Another possibility comes to mind here: Is there any possibility someone stole your refrigerant?
Loren Pechtel's user avatar
1 vote

Nitrogen test not finding leak in HVAC system after all refrigerant leaked out

Are you sure the system is not overcharged with refrigerant? Look at your low side gauge on the left. I typically see the psi for R-410a around 120 psi or so. That pink ring corresponds to a ...
HolyMan's user avatar
  • 11
1 vote

Floor vent is blocked with a metal cone - best way to remove it?

There is no "metal cone" visible in the photo nor the video. The only way you're going to see what's happening from inside the duct is with a very long snake camera. That sort of thing ...
Robert Chapin's user avatar
1 vote

Why is the compressor cooling fan switching off on my my Air Conditioner and overheating the compressor

There is very little chance you can hear the coolant bubbling (in fact, it does bubble all the time when the compressor runs, but it is usually audible in much quieter appliances, e.g. a kitchen ...
fraxinus's user avatar
  • 3,209
-3 votes

Floor vent is blocked with a metal cone - best way to remove it?

Somebody didn't want any air in that room, abd didn't feel like putting a damper in. My ducts have always been accessible, but if not either cut the screw, snip the cone, or just pull on it with ...
Tiger Guy's user avatar
  • 2,401
2 votes
Accepted

Federal Tax Credits for Energy Efficiency

You can only claim the $2000 once per year. You can deduct up to $2000 per year total for the heat pump credit (so you'll max out the credit if you spend $6666 or more on heat pump systems in one year)...
Khrrck's user avatar
  • 408
0 votes

Can I connect a dehumidifier pump to the AC condensate access point in my attic?

I added my dehumidifier drain hose to my secondary pan drain instead of primary. Much safer I think! I just added a tee and put a brass garden hose fitting
guitar guy's user avatar
0 votes

Is it okay for wall AC unit to use a different model’s grille / rear louver panel

It'll be fine. YMMV on louver direction, though. You may find that it blows in an undesired direction. If you don't think that's a concern, don't worry about it.
Huesmann's user avatar
  • 4,000
1 vote

Suggestions to cool very humid garage

I know you asked about cooling and dehumidifying, but try installing a $200 dehumidifier first and see how it goes. The same heat is perceived differently in high vs. low humidity environments. ...
Cheery's user avatar
  • 7,136
0 votes

Is it a problem that the indoor unit of a mini-split AC/heat pump is not properly leveled?

The refrigerant is under pressure, so it doesn't care. The big concern is condensate, which all air conditioners produce - and the hotter/more humid the air, the more condensate there will be. You ...
manassehkatz-Moving 2 Codidact's user avatar
4 votes

Will shading an AC condenser reduce cost or improve effectiveness?

At least in theory it will help; however, read to the end (or skip to the last paragraph)... Why should it help? Rate of heat transfer is a function of temperature difference. Therefore, if the ...
Matthew's user avatar
  • 269
1 vote

Replacement cord for a window air conditioner, what guage cord should it have if it's a 0651515LY with the numbers 14478 on the plug?

A quick search of that number shows a 14 AWG 5-15 connector with a leakage detector. Assuming that (similar to GFCI, but different) is required either by local code or by the air conditioner ...
manassehkatz-Moving 2 Codidact's user avatar
2 votes
Accepted

How can I connect misaligned range hood and elbow?

I ended up using rigid round duct of the same diameter (8"). Steps are as follows: Get 8" round rigid duct (change diameter to suit your hood) and cut it to make a pipe that's a few inches ...
SamuraiJack's user avatar
5 votes
Accepted

What is required to replace a split-AC unit?

How difficult is it to swap out a conventional split system? Well.. after the refrigerant is removed, you'll need to be prepared to cut, bend, and braze copper refrigerant tubing. The connections are ...
Greg Hill's user avatar
  • 31.6k
6 votes

What is required to replace a split-AC unit?

There are pre-pressurized systems that are theoretically homeowner installable. (I'm skeptical.) None are really homeowner removable. The refrigerant must be recaptured and that takes specialized ...
keshlam's user avatar
  • 30.8k
2 votes

What is required to replace a split-AC unit?

Regrettably, installing a mini split air conditioner is not recommended as a do-it-yourself project. The difficulty with is that the system should be completely evacuated before adding refrigerant. (...
DrMoishe Pippik's user avatar
1 vote

Where should I place mini-split heads in a converted building?

9.25m x 6.22m total, bedroom 2m x2.34m in normal units. If want to have cold in bedroom then need at last 3k in each bedroom and 9-12k in living room. And for sure good air vent to force air outside ...
k_z's user avatar
  • 367
1 vote

What size insulation should I buy for my AC lines?

Insulation that's too small leaves a gap in coverage. Insulation that's too large leaves a gap between it and the pipe that allows air (and therefore energy) to escape. Both result in substantially ...
isherwood's user avatar
  • 142k
0 votes

What size insulation should I buy for my AC lines?

Most important is to keep them apart. They run at different temperatures. The thiner one is the compressor outlet (cold line) going to the heat exchanger in the home. the thicker one is heat exchanger ...
Traveler's user avatar
  • 18k
4 votes
Accepted

Tricking a Mitsubishi MR SLIM outdoor unit to run without the outdoor fan?

After much diagnosing, I found that the motor windings and opto-detectors were good but the voltages coming out of the control board to the fan motor were flakey when the motor was connected. Looking ...
bigjosh's user avatar
  • 179
1 vote

What improvements can I make to help house cool down at night after a hot day?

A whole house fan provides air flow through the house by creating negative pressure (ie sucking) air outside through one room, and drawing it in from others in a way you control by opening doors and ...
jay613's user avatar
  • 41.7k
2 votes

Trane comfort 2 thermostat keeps going blank

It appears your thermostat is a "communicating" type, which means that it uses a two-way digital communication between the thermostat and the air handler. Unfortunately this means 99% of the ...
Greg Hill's user avatar
  • 31.6k
2 votes

prevent flooding by portable air conditioner

Go to a home improvement store and buy a condensate pump and some clear tubing that fits on the outlet plus enough to get to a sink. My dehumidifier has a hose fitting so I needed a female hose ...
Tiger Guy's user avatar
  • 2,401
0 votes

Elevating portable air conditioner's condensate drain

Single hose portable AC units have very low efficiency because they suck already cooled air inside the room and vent it outside. I installed this: The transparent pane is insulating plexiglas, into ...
bobflux's user avatar
  • 10.2k
1 vote

Elevating portable air conditioner's condensate drain

I placed my unit in the corner of the room next to a sliding glass door that leads out to our balcony. I then built a wooden stand to elevate it and cut two holes in a board that I cut to fit the ...
Steven's user avatar
  • 11
1 vote

AC Condenser Motor Only Runs Correctly in One Direction

The fact that the diagram shows a single capacitor connected to the two brown wires without any connection to mains power, and the fact that one can optionally use a dual capacitor (which does connect ...
Greg Hill's user avatar
  • 31.6k
0 votes

AC is freezing up

Most AC coils freeze up for three reasons. One not enough air circulation, two refrigerant charge is low (maybe caused by a slow leak), and three refrigerant overcharge. In general I think used just ...
Retired Master Electrician's user avatar
1 vote

How to Determine Condensate Line Exit

it should be outside (obviously), and it looks like PVC pipe (about 1/2 inch) and about 1 foot from the ground. To unclog, use some bleach (to kill the mildew) and then pore a gallon of water while ...
Traveler's user avatar
  • 18k
4 votes

How can I connect misaligned range hood and elbow?

Don't use an elbow. Use a box duct. You don't have to stick with bendy round tubes for things like this. If you build a box, say from an off-the-shelf rectangular duct of suitable size and associated ...
isherwood's user avatar
  • 142k
3 votes

How can I connect misaligned range hood and elbow?

There is no reasonable way to mate those two in their current positions. If replacing the hood with a different one is an option for you, where the exhaust port is in the right place or is much lower ...
jay613's user avatar
  • 41.7k
2 votes

I want to replace the current 3 yr old Honeywell thermostat,with a newer Honeywell model with remote sensor. Is this a DIY?

Replacing a thermostat is generally a pretty straightforward task, but it's difficult for people to judge what you are comfortable with doing. If you're planning on using a wireless sensor, this ...
Michael Mior's user avatar
3 votes

Spending $$$ on energy efficiency heatpump attached to old ductwork? Smart?

Regardless of which contractor that you go with, the first step should be to get a 'Home Energy Audit' that includes a Blower Door / Duct Leakage test. Your 22 SEER level system could have as low as ...
Earl's user avatar
  • 503

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