Questions tagged [hvac]
(Heating, Ventilating, and Air Conditioning) For questions about installing, repairing, and troubleshooting HVAC systems.
3,345
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What is the fully burdened hourly rate for an HVAC installer? [closed]
While it's pretty simple to get an hourly rate that is paid to an HVAC installer, I have found it more difficult to ascertain what the fully burdened rate is. This is the complete cost a company to ...
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Water/antifreeze radiator cooled work shop
An additional line of thought.
Cooling radiators in summer?
I found this having the same concept for cooling. I live in south louisiana, US where 95F is vary common turning tin boxes into a slow ...
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HVAC plastic drainage tube snapped off outside
The plastic tube where the condensate drains outside has broken off partly. I would say about 2/3 of it broke off. It still points away from the house a little so shouldn’t get on the wall. Should I ...
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Would a replacement condenser capacitor of differing specs reduce cooling?
My outside condenser fan quit running, so I tested the capacitor, and got nothing on the meter. The cap that was in there was a 35/7.5. The closest one I could find at the time was a 50/7.5. Now ...
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Hvac fuse blowing on furnace board
A 5 amp fuse keeps popping at startup on my tempstar furnace,had a problem a couple weeks ago and put fuse in and worked fine.Now it blows instantly.
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Adding ventilation to an older outbuilding
I have a large to me storage building that I am trying to convert into a garage/workshop. I don't have the time/money/inclination to tear the whole thing down and start anew so I am trying to make ...
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2
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37
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Placement of a package unit heat pump for my shop
I was wondering if I would benefit by locating my 3 ton package unit heat pump closer to the load center. The ducting would be my only interference with it closer to the load center. The unit would ...
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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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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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How do motor capacitors change in value with respect to age or environmental factors?
Do motor capacitors (i.e. start, run capacitors) change in value with respect to age or other environmental factors? I understand they fail, as observed when the motor will no longer start. Do they ...
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Fan on propane furnace not coming on
I have a Honeywell model number NHGK076AF01 propane furnace. It is about 15 years old. The problem started when I noticed the breaker had tripped and I had no heat. After resetting breaker, I tried ...
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Musty Smell in slab and block house
As my title states, I have a house that is on a slab and the exterior and most interior walls are block and covered with plaster. Since we bought the house we have noticed a musty smell that we ...
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What is an air conditioner compressor hard start kit and how does it work?
My air conditioner compressor wasn't functioning properly recently. The compressor wouldn't start when the start relay energized. A HVAC technician diagnosed the problem nebulously as "It needs a hard ...
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AC unit dripping onto crawl space vapor barrier
I just bought a house whose crawlspace looks like it was partially converted to being sealed off. Basically, they put down a vapor barrier and closed off the vents, but didn't finish the job. On top ...
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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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How do I remove these ceiling diffuser flaps?
I need to move this diffuser away from the wall and can't figure out how to take out the flaps that are installed. They don't have any screws on the inside that I can see. Is there a trick to ...
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How thoroughly should HVAC evaporator be sealed?
I noticed that cold air was rushing out of the seam near my AC evaporator, so I added foil tape around the seam (see photo). Is that appropriate, or does that minor leakage serve a purpose? The rest ...
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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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AC red wire placement on control board?
So a fuse(3) on my control board blew at the same time my ac capacitor did. I replaced the capacitor with the exact one that was on the old unit and when replacing the fuse noticed a stray red wire... ...
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Using existing hot water vent for extraction
I have a room in the basement with equipment (computers) that gets really hot. There is an ac vent but the thermostat is nowhere near the room.
Also in an alcove is the hot water heater behind a ...
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AC contactor 1 pole or 2?
I wanted to title this: Outside unit running, but thermostat is off but I'm 99% sure its the contactor unless someone here says otherwise.
Thus my real question: which contactor should I buy? I typed ...
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Adapter for NTC boiler probe
I just bought a replacement NTC probe for my boiler (bought with specific part number) but once the item arrived I noticed the connector wasn't matching. I think this is due to past maintenance when ...
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Central Air is Blowing cold air outside
I change the capacitor and cleaned all of the coils inside the interior unit and outside along with the fins and the blades with a professional solution. I had the HVAC refrigerant filled. I cleaned ...
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How to hardwire combined HVAC system for cooling?
I had to borrow the Nest thermostat from one of my units for another one where it was more needed, while a replacement is on the way. The unit from which I borrowed is combined HVAC (heat+cool) with ...
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After installing a mobile AC, I do have hot air intake from the front door
I have installed an appliance like the following one:
Its hose is connected to what acts as the 'chimney' of the building.
Now whenever I turn it on, I can feel that hot air is coming from the front ...
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Wiring AC condenser to Furnace
Hello
So this is what I was left with
I am trying to tie in fan on/off and a AC condenser
I have 2 wires for my limit switch, 2 wires from my 24ac transformer, 2 wires from my AC condenser and 2 from ...
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1
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AC service disconnect keeps blowing fuses
About 1-3 times per summer the same fuse blows in my AC service disconnect. Always the one on the left. The fuses are 30A and on the panel there are two 30A breakers. The fuse blows typically on a ...
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Air conditioning fan not turning, motor very hot
The air conditioning in one zone of my house isn't turning. I have a Goodman air conditioning unit in that zone. I noticed that the fan motor was very hot (estimate 150 degrees F). It was much ...
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Custom HVAC control
I currently have a Nest controlling my LP furnace. I'm getting an evaporative cooler installed and I'd like to also control it with my Nest. This post gave me a good starting point, but I'd like to ...
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A/C intermittently won't cool
I have a 2 zone system that intermittently shows temp 2 degrees or so above set point; on one or the other thermostat, day or night. At some point, the condenser kicks back on and everything works ...
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Does anyone know what this pipe is in an HVAC system?
In a new rental (one story, approx 1400 sq ft), one of the bedrooms was not as cool as the other two. I noticed air flowing from the attic door in the ceiling, so went to investigate. The pipe (thin ...
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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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Should I open my AC register in the basement to help with condensation?
Really hot in NJ this week, excessive heat warnings, and the like.
Daytime Temp: 96 degrees
Daytime Humidity: 55%
Feels Like: 105 degrees
Nighttime Temp: 79 degrees
Nighttime Humidity: 87% ...
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137
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Trane HVAC in horizontal position - why does evaporator throw condensation?
I appreciate assistance from anyone who has had or understands the problem.
I have a Trane HVAC system in a horizontal "left" flow configuration in the attic. Ambient temperature is about 95 ...
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802
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Installing Nest Thermostat. C Wire not hooked up inside furnace
Good morning. I am looking to hook up a Nest 3rd Gen thermostat that I purchased. I noticed I had a C wire upon pulling the old thermostat. Problem is it is not connected inside of the furnace. I have ...
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2
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Thinnest screed over the water heating floor
I installed a water heating floor system with 17 mm pipes and studded panels.
This is how a studded panel with a pipe looks like:
It has 52 mm height (the polystyrene has 30 mm).
Now I want to add ...
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1k
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Condo fan coil thermostat fan never turns off, cooling is humid
My thermostat in my condo is a honeywell thermostat and it the only options it has are System and Fan. Fan is set to auto (other option is Lo Med Hi) and the System is set to Cool (or Auto or Off). ...
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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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1
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A/C capacitor replacement
Can a CBB65 55+15uF+/-5% 250VAC 40/70/21 dual capacitor in a window mounted a/c unit be replaced with a 50+15uF +/-5% 250 VAC 40/70/21 safely?
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Can I pull a common wire off an evaporative cooler transformer relay?
I have a Nest thermostat currently controlling a LP furnace. The old thermostat didn't have a common wire connected, but there was a an extra wire in the bundle and a common terminal on the furnace ...
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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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Carrier Furnace (6-wire) to Honeywell thermostat --> no cooling :-(
Carrier Furnace w/ Honeywell WiFi Thermostat
I have a Carrier furnace with the cheapest programmable thermostat (TB-PHP01) that came with my house. The thermostat uses six wires: Y, C, R, G, W, and O. ...
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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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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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2k
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Mysterious Metal Plate on Basement Ceiling?
There is a metal plate on the top of my basement's celing.
It is attached to the HVAC ducts, but doesn't appear to be a duct itself.
I'm interested in using the stud it is attached to hang an LED ...
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2k
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Is my furnace leaking water?
I have water accumulated in my basement, that I squeezed out using towel. It was about 8 gallons of water in all. The only source I can see is the furnace whose surrounding is wet but I have never ...
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A/C Fan won't turn on outside after replacing capacitor
I know this is a DIY stack exchange, and to be forthright, I did not DIY this initial repair because I was intimidated by replacing a capacitor, so I called a recommended technician who did the job ...
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505
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Central AC Unit - Intake is very cold
So my central AC unit started doing something that I have not experienced before.
Once the AC stops, cold air comes out of the intake vent, like really cold air. This has lead to ice forming on the ...
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Why the noises in the new furnace?
A company installed a new HVAC system 2 weeks ago. The furnace is a Carrier Infinity 58TN.
Two days ago I noticed a low key constant noise from the furnace in the morning around 6:20 am. The noises ...
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1
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Competing conditioned/combustion air flow; worry about CO?
My home has a partially-below grade basement that has a "Wave" ventilation system that brings cool, conditioned air in from the main house. The basement has an equipment room containing an oil burning ...
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