Questions tagged [hvac]

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

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2answers
67 views

What can be safely attached to a gas furnace cabinet?

The gas furnace in my house is in my laundry room about 3 inches from a stacked washer and dryer. As such, my laundry room is short on space, so I had the thought I could add some organization by ...
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1answer
165 views

Aprilaire 600M Wiring to Honeywell TH8321 Stat

Very rookie DIY guy here...I have installed an Aprilaire 600M but can't figure out how to wire it. My thermostat currently is using the U1 port for a normally-closed damper on a fresh air intake. I ...
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2answers
55 views

How to troubleshoot HVAC for room that is uncomfortably warm in both hot *and* cold weather?

I have a room in my house that I spend a lot of time in. It is consistently uncomfortably hot in the summertime. A thermometer on my desk will read 80 degrees or more in the summertime. I was told ...
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1answer
30 views

Need to determine the correct start capacitor for hvac unit

I need to replace the start capacitor in my HVAC unit and I don't see any identifiable markings on it. This unit also has a heat pump. I believe this start cap is for the heater. I found the part ...
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2answers
44 views

Removing excess HVAC ductwork for efficiency

I have central ac in my home and at some point the kitchen was redone, blocking an existing vent permanently. The flex HVAC ductwork leading to the vent (probably 8 feet of it) is still there. Should ...
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2answers
71 views

Is there a way to easily split a wall register?

I have a small powder room that doesn't have a register/vent so it gets a bit cold compared to the rest of the house. I could install a new duct line split off from the main but there is a wall/floor ...
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1answer
151 views

c wire on a multi taco zone valve boiler

looking for assurance on what I think is the right setup to add a c wire to a current 2 wire zone setup. See pic of transformer junction box. Currently I have 3 zones using one transformer and 3 taco ...
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1answer
42 views

Force Furnace Blower to Run on Separate Schedule to Circulate Air

Appreciate any and all insights you might provide. I could tamper with this until I figured it out but I'm hoping that your collective expertise will save me some time and keep me safe! I've got an ...
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2answers
64 views

Over the range microwave venting

I am installing my OTR microwave. The venting looks like it will definitely not align (thanks HVAC guy). In any case, can I simply use flexible venting to connect the microwave flange to the roof ...
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0answers
32 views

Can someone verify my wiring for Trane XE90 with Aprilair 600

I received my unit this morning and there was a diagram that says its better to wire the humidifier to the EAC, this way I run run the humidifier without running heat, which makes sense. Unit also ...
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0answers
65 views

Problems w/ Nest

I've got a common problem but I can't seem to find the simple answer. My heating system is simple. Forced water oil boiler with three zones. Two zones are controlled by the Nest E Thermostat. I'm ...
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3answers
148 views

Why place humidifer on cold air return

I'm trying to understand why a whole house humidifier is placed on the cold air return where water is injected into the air flow and then it has to pass through a five inch filter before entering ...
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1answer
733 views

How to troubleshoot a leak in an Aprilaire humidifier?

An Aprilaire 600M humidifier attached to my HVAC vent is leaking very slowly, about 2 ounces per day. I have not seen it leak but the leak is coming out near the exhaust at the bottom of the plastic ...
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0answers
40 views

Minimum water pressure for swimming pool boiler?

I have a swimming pool gas fired boiler (Crown Aruba) 150,000BTU. It is NOT a closed loop system. It takes the water out of the swimming pool, heats it in the boiler, and dumps the heated water back ...
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1answer
33 views

Are the indoor unit's fan suppose to stop when set temperature is reach for Dakin mini splits?

I have a Daikin ductless heat pump with 3 heads. When the set temperature is reached, no heat comes out and the fan stops? Is the indoor fan supposed to stop after reaching the set temperature? I don'...
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1answer
83 views

Blower motor compatibility

First off I would just like to thank anyone who takes the time to read and help in any way. I need to replace a old blower motor which is now obsolete. That part number is (1150519). I need to replace ...
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2answers
36 views

What is the right A/C contactor part that I need?

I need to replace my A/C contactor, but I'm not sure what exact model I need for the new part. I took two photos showing the Brand and model number of it but when I search it on Amazon, I cant seem to ...
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0answers
40 views

Thermostat C-wire not working

I recently switched out my old thermostat for a new thermostat. The previous thermostat had an R, Y, W, G, and C wire. I plugged all of these wires into the same ports on my new thermostat. After ...
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0answers
129 views

Carrier Furnace Pilot light and Main Burner Flames out when main blower kicks in

Carrier furnace runs for about 3 minutes. Hot air comes out from vent for a minute or so it then turns off and kicks back on after 1 minute or so. I cannot find the model of the unit as the tag is so ...
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2answers
88 views

Why is my aircon increasing relative humidity?

My HVAC unit in the bedroom seems to increase humidity when turned on. I live in the tropics so humidity is 50-80% on average. Even if its 55% outside turning aircon on it seems to reach a level ...
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1answer
134 views

Connect C wire for nest thermostat on a zoned HVAC system

I got a nest thermostat which requires to get a C wire. My old thermostat does not have c-wire connected, but there are four unconnected wires as shown in the picture. Then I came to my furnace and ...
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0answers
25 views

Should I expect a whole-home humidifier to provide consistent humidity throughout a 3-story townhouse?

I'm looking to install a whole-home humidifier in my 3-story townhouse in northern Virginia. I already have trouble keeping a consistent temperature throughout the 3 stories - should I expect similar ...
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1answer
39 views

Piping humidified air through a wall

I have very low humidity in an upstairs bedroom. For various reasons I cannot keep the door closed, so your average "single room" humidifier doesn't move the needle. It's a cold climate, so ...
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3answers
105 views

Why is the spigot on my oil heater dripping?

We have fuel oil and a Beckett oil burner that heats our house. I just noticed water is dripping out of this hosebib/spigot at the bottom of it: What could be causing this and how can I troubleshoot? ...
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0answers
34 views

HVAC Furnace blowing fuses

I'm having trouble with an older Nordyne HVAC unit. Current situation: Immediately after turning the unit on with a heat signal from the thermostat, the fuse on the control board blows. Most recently ...
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0answers
27 views

Heat basement from excess heat in boiler room

I'm trying to heat a basement room using excess heat from the boiler room but it isn't working. I've run two 4 inch flex ducts from the boiler room to the main 300 square foot room at opposite ends. ...
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1answer
49 views

Two story, two systems, one return from the upstairs feeds the downstairs

I’m having two new hvac systems installed. Everything seems legit, except that instead of putting an extra return for the downstairs system downstairs, they put it in a bedroom closet upstairs because ...
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1answer
53 views

What skills and tools do I need to install a whole-home humidifier?

I'm looking to install a whole-home humidifier and am wondering what tools and skills are needed for the job. I'm specifically concerned about a non-standard installation or if something goes wrong / ...
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2answers
58 views

Thermostat wiring question

Got a free smart tstat from the electric company. Took off old tstat took picture, went to basement to check colors on the unit and r, w, and g matches up but the blue wire is connected to c on hvac ...
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4answers
2k views

Conduit to run ethernet and coax from basement to attic

My basement has a couple Ethernet and coax cables (thin black and white cables) running from the basement to the attic. The opening also has a gas line, white PVC drain line from the attic HVAC, HVAC ...
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3answers
62 views

Need to move the dryer vent up by 3ft

I just bought a stacking washer/dryer machine and I need to relocate my floor dryer vent by 3ft above the floor so that I can push my machine all the way against the wall. This will give me about ...
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0answers
143 views

What type of insulation do i need to replace in my AC air vent registers?

We noticed we had mold on our register grills due to one of our AC unit not draining anymore in the attic (water was ponding in the pan); we had a remediation company come out and they told us we ...
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0answers
22 views

Goodman AC inside fan will not work at night

My Goodman AC unit is about 4 years old. In the past few months, during the night the outside compressor will kick on as required but the inside fan will not run. The outside unit will continue to ...
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1answer
60 views

How to connect a semi rigid aluminum duct to a rigid aluminum duct

In a 4 story multi-owner house in Rotterdam, the Netherlands there is an 80mm semi-rigid aluminum duct like the one shown in the image below which contains the water heater exhaust of my neighbors who ...
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1answer
24 views

HVAC has filters on returns only

New home purchase and was surprised that the heat pump air handler does not have a filter inserted. The filters are on the returns only, but are very well fitted. There are two returns. Is this an ...
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0answers
26 views

Heat pump thermostat wiring, can I leave the Optional C terminal empty?

We have an old Carrier Heat Pump system. The thermostat tells me that "C IS OPTIONAL WITH BATTERIES". The thermostat does have batteries. So I can leave the C terminal empty and use the ...
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1answer
83 views

Is this insulation in my HVAC installed correctly?

Inside my HVAC (past the horse hair filter) is a large gap before the air hits the radiator. The inside of this area appears to be lined with some kind of fiberglass insulation. I asked maintenance ...
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1answer
49 views

Can I put a “U” turn in my range hood exhaust duct?

In the photo below The red arrow represents the direction of the exhaust, as you can see there is a load bearing joist in the middle which I can't cut. I'm planning to build a recessed ceiling on that ...
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1answer
57 views

Should I insulate the duct trunk as I finish my basement?

I'm in the process of finishing my basement and am currently planning out my HVAC. I live in Minnesota so I'm trying to do what I can to maximize heat delivery/retention down there so I don't end up ...
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0answers
32 views

Compatible filter for a Hiyasu HR-24LA HVAC unit?

We bought a house with the A/C installed. We found a lot of dust, and realized that the filter was entirerly missing in the indoor unit. I have found it in the Hiyasu catalog, and I found a manual for ...
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2answers
38 views

Basement HVAC supply location

I'm finishing my basement and I'm wondering how I should approach placement of the supply vents. I live in Minnesota so my primary consideration is to do what I can to make sure the space can be kept ...
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0answers
38 views

How best to capture and move the heat from oil furnace stove pipe more efficiently throughout room

In my basement the stove pipe that goes from the oil furnace to the chimney is always hot, so I feel like I should be capturing this extra heat and moving it about the basement. How do I keep this ...
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0answers
24 views

Ventilating a flat roof

My ensuite bathroom has a major humidity problem. I took the fan out (it's one of those combo heat lamp + light + fan units) expecting the fan to be broken, but found another problem - it's just ...
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1answer
41 views

Is this typical for how hot water heating loops are plumbed?

First time owning a home with hot water heat, and studying the plumbing the basement, I notice that the living room/kitchen zone that has a run of baseboard, a kick panel unit, and several floor units,...
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1answer
120 views

HVAC: adding a C wire for Nest thermostat

Just installed a brand new gas boiler, want to keep using my existing Nest thermostat (they are compatible according to Nest). Current system only has two wires: Rh and W Nest is designed to steal ...
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0answers
31 views

Replacement HVAC blower motor fails within 24 hours?

My unit is a Carrier Infinity (FE4ANF003T00ABAA) with an ECM 3.0 blower motor. To start, the thermostat reported a “Code 41 - Blower Motor Fault”. I ordered a refurbished motor + control module online ...
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2answers
53 views

Should AC coolant pipes be mounted on the exterior?

Contractor recently installed a new AC unit and mounted the copper pipes running up the wall on the outside. This is in California, plenty of sunlight and hot days. Besides looking unsightly, are ...
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0answers
91 views

Will a backdraft damper in a air return duct cause issues with the gas furnace?

In our attic is a gas furnace for the 2nd floor. The attic is not insulated (except for the attic floor which is the 2nd floor ceiling). The air return for this furnance is in the 2nd floor ceiling on ...
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0answers
28 views

How to identify Direct Return vs Reverse Return Pipe

Is there an easy way to tell if a hydronic heating system has direct return pipe or reverse return pipe?
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1answer
25 views

How to seal swamp cooler wires going into roof

I was shutting down my swamp cooler for the season and notice that the sealant around the wires going down into the roof has opened up. I assume it would be a good thing to seal this to keep rain and ...

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