Questions tagged [hvac]

(Heating, Ventilating, and Air Conditioning) For questions about installing, repairing, and troubleshooting HVAC systems.

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33 views

AC not blowing cool air, Contractor said HVAC unit is perfectly fine and that it has to do with my smart thermostat (Ecobee 3)

So basically I changed out the filter on my HVAC unit (National Comfort Products, Model CPG41238-U23) and after I did that the AC stopped blowing out cold air. It was working completely fine until I ...
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1answer
68 views

Can Home AC Electrical Whip Cause Compressor Failure?

I have an 11 year old Arcoaire ac unit. The other day we heard a pop sound and noticed a little smoking coming from the electrical whip casing. The part of the casing with the issue is about half ...
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54 views

Replaced AC Filter and now AC is not turning on

I just changed the filter for my National Comfort model CPG41238-U23 AC unit and now the unit is not turning on. Initially it was turning on but constantly short cycling every 30 seconds. Now the unit ...
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1answer
27 views

AC intermittently doesn't cool

I have a Lenox system that is AC only (my heat is separate). On occasions, maybe 10-20% of time, it doesn't cool and the fat refrigerant pipe coming out of the air handler going to the condenser ...
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1answer
125 views

Is TXV required when an appropriate piston/orifice is used?

I had a Goodman GSX140181 1.5 Ton 14 SEER Air Conditioner R-410A installed with a Goodman CHPF3636B6 3 Ton Horizontal A Evaporator Coil installed by a contractor. It came as a kit, along with a ...
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61 views

Two vents in utility room, one to AC one directly to attic where hot moist air comes from?

I have a question about my AC system/attic/laundry room. This is a new house built in 2019. Been living here for a year. I Noticed the laundry room has always been humid and figured it was because of ...
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1answer
558 views

Did I fry my Furnace Control Board? (C -> G rewire attempt)

So while I was attempting to figure out how to get our fan to run independent of our heating/cooling, I looked at our thermostat wiring and discovered that it only had wires running to C, W, Y, and RC/...
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2answers
713 views

Is there a required or recommended minimum distance of an HVAC duct from an exterior wall?

I am removing an interior non-load bearing wall and need to move an HVAC duct a few studs over. I am leaving a short wall near the exterior to accommodate the duct as well as to serve as an endpoint ...
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1answer
77 views

Is negative pressure bad and how to fix?

I have a one story house and I think there is a negative pressure problem. If the central a/c is on and I close the hallway door the hallway heats up like an oven. This hallway leads to all the ...
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367 views

Cold air blowing from return air vent

Cooling stopped working on my second floor zone, and cold air was blowing out of return air vent. I turned off the power to HVAC , it didn't work. When I turned off the thermostat of my second floor ...
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2answers
57 views

How to calculate efficiency of old Westinghouse furnace VS new variable speed Furnace

We have an old Westinghouse Forced Air Furnace (model FGUB137EG). It's been working fine, with the occasional pilot lighting issues since we moved in 6 years ago. We've been thinking about adding ...
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27 views

Is there an easy fix for bad air balancing?

This is my situation: My condo has central heating and air with a zone for each of the two floors, but the balancing of the system is pretty bad: Our upstairs master bedroom and our upstairs office ...
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1answer
56 views

Sizing HVAC: 3 vs 2.5 ton AC, 60k vs 40k BTU furnace for 1200sqft?

I'm adding a HVAC system to my single-storey SFH (1200sqft in climate zone 2, San Jose, CA) and the contractor picked out the following system: Furnace: 60k BTU @ 80% Efficiency AC: 3 Ton @ 14 SEER ...
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4answers
160 views

Where is A/C switch? How to turn it off?

I'm trying to install a new c-wire based thermostat, and I plan to turn off the A/C power before I touch the C and R wires (24v). However, I couldn't locate the power switch. The breaker box has some ...
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28 views

Nest thermost not working with Rheem A/C C wire

My A/C unit was recently replaced. I have a Rheem RGEA14036AJT06XAB. The techs installed a pretty bare-bones thermostat since my old thermostat was reading 5 degrees off. So I decided it was a good ...
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1answer
52 views

Is wiring supplying an integrated HVAC breaker a branch circuit or feeder?

Since this air handler / furnace has overcurrent protective devices in it, would my wiring from the panel then be a feeder or branch circuit? I kind of think it would be a feeder circuit. And that ...
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1answer
67 views

Safe & chemical free way to clean AC coils?

My ac system last had regular maintenance/inspection 9 months ago. Normally I have it done every 6 months but due to coronavirus the company I have a warranty with isn't honoring their warranty. And ...
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2answers
60 views

Is it worth of replacing central AC coil?

my central AC is a 16-year old Trane. According to inspector, the compressor is still good and all the conditions seem to be good, except the coil is leaking. It is an old model so it uses R22. As it ...
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1answer
22 views

YORK AC unit rusted support arm

I have an old YORK ac unit still running R22 and have recently cleaned the entire unit inside and out. As I took apart the unit, one of the 4 corner supporting outside vents was rusted completely and ...
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2answers
71 views

A/C units sweating in the attic

I have 2 Heil 19 SEAR units that are sweating tons of water in the pan. They are V speed units that can regulate the humidity in the house to 50 t0 55. The house is a foam house which has been sealed ...
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3answers
63 views

Does this seem like the right place to tap a C-Wire from my heater?

I need a C-wire for my thermostat but my heater only has R and W connectors (red circle). On the schematic on the heater, up top (red arrow), looks like: 5 is 24V Gnd (bit hard to read but i've ...
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0answers
116 views

How does this wiring work?

I have a Trane XV90 and XL 14i. The wiring looks a little strange as in the picture bellow. _____________ | | BK W2 W1 R G Y B/C YLO O |___||...
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37 views

Can I use a portable AC Inside my outdoor enclosed cabana for my massage therapy work during summer?

Can I use a portable AC Inside my outdoor enclosed cabana for my massage therapy work during summer? I was thinking putting the vent underneath one of the side panels. Probably need to duct tape the ...
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0answers
24 views

R and G wire jumpered and G is not connected to thermostat [duplicate]

I have a Trane XV90 furnace and XL14i AC. The thermostat is old and I want to install a Honeywell Wifi one. Today I just checked the wires and found on the control board R and G are jumpered and the G ...
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2answers
44 views

Which AC Hard Start kit capacitor I should use?

My AC system is getting very old and I was wondering if I should add a Hard Start kit and with what spec? Here is my AC spec included below and the existing Dual Run Capacitor is 440volt and 40+5MFD.
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1answer
65 views

How can I keep my southern facing bedroom cool in the Arizona Heat?

Our MB is on the South side of our house in AZ. It stays warmer than the rest of the house. I am considering installing and 8" in-line booster fan at the 'T' where the supply duct (flexible) ...
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1answer
65 views

Adjusting Blower Speed for Central AC

I am trying to lower the fan speed on blower fan. It is currently set to factory default setting. My AC is 3 ton unit. Model no is 4A7A3036H1000NA. The fan settings on IFC are like TAP 1, 2, 3.... and ...
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2answers
104 views

How to properly repair siding holes

I noticed the AC installation by my house's previous owner left an unpatched hole in the siding, close to the ground. We have a lot of rain in the fall/winter. I don't know how long it's been like ...
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0answers
25 views

Blaring noise from newish indoor AC unit

Why is my AC making a noise like Mass Effect Reaper every 20-60 seconds and how can I stop this? https://webmshare.com/play/qd07r
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3answers
2k views

There is a pvc pipe that goes into my floor next to my water heater and central ac unit and its overflowing..but why?

Let me start by saying i'm not a plumber nor have i done HVAC. Last night i walked in and noticed I've have a leak in the corner of my living room so i looked for where it was coming from and on the ...
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2answers
22 views

Air conditioner HVAC filter size and frequency of change

I've been struggling to understand air filter sizes and the frequency of changing them out. We have a Rheem 4 ton AC unit. Below is the filter (20x25x4) we currently have in our attic and some info ...
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21 views

AC blower turns on and off 1 or 2 times per second

I have a Carrier Weathermaker 8000. When using the A/C and the house is below the temperature called for by the thermostat, the blower motor randomly turns on and after 10 seconds or more will start ...
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0answers
55 views

HVAC blower comes on by itself. Even after I remove the thermostat wires

I have a rheem classic 90 furnace/AC. From the past one month, I am noticing that my blower fan turns on, runs for 2 mins and then turns off when thermostat is off. Also, when running the air ...
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1answer
59 views

Blown Thermostat Twice and Dead Transformer

A year ago, I had a brand new smart thermostat that caused the A/C fuse to keep blowing. I replaced the thermostat with a duplicate, swapped the fuse out and everything has been fine. Now a year ...
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19 views

Relocating Return Air Duct and Determining Register Box Size

I have a 14-inch diameter return air duct that I'm relocating. The duct was formerly connected to the floor where a roughly 16 x 15 inch hole had been cut from the subfloor to let air get to the ...
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0answers
59 views

Should I move an HVAC vent to the ceiling or on the opposite interior wall?

The below picture shows the current position of the vent (the white area over the sink). The blue patch above the toilet is a small window. The plan is to relocate the bath tub and position it along ...
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1answer
47 views

Do I need OEM filter replacements for a whole home media air purifier?

I purchased a home that had a media air purifier already installed. Specifically, it is the TopTech TechPure TT-MAC-2025 (installation manual). The manual specifies the filter should be #TT-FM-2025(...
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1answer
54 views

What's the best way to relocate my wall vent?

I recently removed a closet in our main living area and one of the closet walls contained an AC supply vent. This left a 4x12 hole in the floor where the old stack head was removed. While we could ...
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1answer
37 views

Adjusting ECM motor air flow

I recently had the following Rheem ROCB furnance installed. https://www.rheem.com/product/ROCB-118P05-M It's paired with a Rheem 5 ton condenser for cooling. However, I feel the air flow is set way ...
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3answers
127 views

AC not shutting of automatically

I recently had new HVAC installed. I am noticing it being little louder than what I had previously. The new system is American Standard 80% efficiency with ECM blower motor. My question is Can I ...
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2answers
72 views

AC leaking into drip pan in the attic

I apologize in advance for this long post. This is the first summer in this home that I bought. I'm a first time homeowner. One day I realized a big stain in my ceiling right under the attic and found ...
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1answer
44 views

Can I use hot water to transfer heat from a greenhouse into the house?

We have a vacation house that has a (south-southeast facing) greenhouse off of one of the bedrooms. On a sunny day in winter, the greenhouse can easily reach 80F or more. When we are there, we open ...
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2answers
76 views

Is my brand new central air conditioner short cycling?

I just had a brand new air conditioner 5 ton condenser, coil and furnace installed in a 3,300sqft colonial in Connecticut. It’s 1am right now, 75 degrees outside with 97% humidity. I have my upstairs (...
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1answer
58 views

ECM Blower Motor Not Working at Night

So, I have had this problem going on for about a month and a half now with my A/C. Throughout the day, the A/C will work fine. However, there will come a time in the middle of the night when it ...
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0answers
55 views

Condensation on HVAC, mold on joists/subfloor in basement

I have heavy condensation on the plenum and supply line near an exterior wall/window in my unfinished basement. I have mold and moisture on my subfloor and joists just in this 3 sections. I sealed up ...
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2answers
73 views

Should my ground-level package unit have a condensate drain trap?

I recently got a new package unit installed to replace the 30-year-old one that came with the house. It works MUCH better than the old one, which had a slow leak and iced up regularly. I noticed that ...
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1answer
32 views

What is the deltaT test for a PTAC AC?

I have a PTAC AC that blows cold air, but barely cools the room. The landlord is claiming its because the room is the livingroom and its an open to the kitchen and hallway. I know that the rule of ...
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1answer
20 views

What would cause my line sets to equalize in cooling mode?

My heat pump line sets only get different temperatures briefly on startup in cooling mode. Then the hissing noise stops and they equalize and only the lower 1/4th of the a-coil gets cold and ...
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1answer
60 views

Leak check mini split AC

I am finishing up a 6 zone mini split DIY installation and before closing up some of the walls I would like to do some leak checks. My set up is that from the condenser it splits into 2 branch boxes ...
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1answer
49 views

connect switch handy box to plenum?

would it be code to attach the 2 x 4 handy box with the switch on the plenum as the old furnace set up would hook up on the new furnace with the bx cable coming off bottom of handy box to furnace ...

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