Questions tagged [central-air]
For questions regarding a central cooling system for your home. This is typically a split system with an outdoor compressor/condenser and an indoor evaporator and air handler. Air ducts are used to cool air throughout the home.
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Can a heat pump designed for mini-split system be used for central AC ductwork?
I am looking at replacing my old central AC unit with a heat pump one using existing ductwork. A contractor quoted me Fujitsu Airstage indoor unit AMUG48LMAS with outdoor unit AOUG48LMAS1. I checked ...
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Air register solution for this spot in the kitchen paneling?
We have this spot under our kitchen sink where there's a spot for the HVAC system to push air into the kitchen. The black item to the far left is our dishwasher. I believe these are IKEA kitchen ...
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Air conditioner outside unit / condenser does not come on when thermostat calls intermittently / usually works after switching break/pulling fuse
A few times over the past two weeks, my central AC unit would stop producing cool air. The inside fan (furnace blower?) would be working, but since the fan on the outside condenser was not running it ...
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HVAC question about Evaporator Coil repair
My evaporator coil was recently replaced (Carrier CNPHP6024ALAAAAA replaced with a bigger unit, CVPMA6124XMC). They sealed around the edges with tape. The original install was sealed with some kind of ...
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HVAC condenser fan overheating/shutting down turns out a bad control board
Two weeks ago my condenser fan started overheating after 15 to 30 minutes of runtime. Seeing as capacitors are cheap I replace the capacitor first. The problem persisted so I ordered a new fan motor. ...
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How do I add central AC to my existing central heat system?
We currently have central heating. The unit is in the attic. The duct work is also in the attic.
How would I go about adding central AC to my existing setup? How would I go about doing this my self?...
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Why is my house getting warmer despite the A/C running?
Temperatures in my house have been climbing despite the A/C running.
My condenser unit is running, appears clean, and no brush is growing against it. The pipe into the ductwork above the heater is ...
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vent damper looking for lever
I have attached a image of a vent we have in the house. I like to know if this has a damper I can adjust? I don’t see anything where there is a lever to turn? Any help would be great.
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Condensate pump making loud noise
Attached to my furnace, there is a Beckett CB151UL condense pump. After every cycle of the furnace (either heat or cold) the pump, removes water from itself. It has started doing a loud whining/...
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Furnace Fan Only Turns On With Heat
Recently had a mini split installed, and the HVAC tech recommended that I occasionally turn on the fan to circulate cold air throughout the house. Tech changed the thermostat to a Honeywell Prestige ...
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Should my air conditioner be running its air directly through internal spaces?
Should a newly installed “ducted” split system be running its intake air directly through internal spaces, or should I demand that the system be sealed so that it only draws air from living spaces?
I’...
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Leaving second floor window open while running central AC [closed]
We know that windows should be closed while running the AC, but since the central AC and thermostat of my house is on the first floor, I was wondering whether leaving the window open decreases the ...
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Two Identical A/C Units with Different Readings / Pressures not Stabilizing When Off
I have two separate systems with one in the basement servicing the main floor, and the other in the attic servicing the upstairs. The upstairs has been struggling in 90F heat ever since we moved in ...
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Optimizing HVAC airflow for cooling
Here's the deal:
Two-story c. 2000 house in southern Missouri, lower level is a "walk-out basement" (subterranean on 3 sides) and consistently 10 degrees colder then the main level year-...
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HVAC unit upgraded, contractor cut a new return in the oddest spot
My old HVAC system suffered damage due to a lightning strike. I called up a local service co. and they sold me on a Trane split-system that was slightly oversized compared to what we had. The new ...
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Why is my air conditioner causing rapid high CO2 levels?
I am wondering if anyone knows why when I turn my recently installed high-efficiency air conditioner on, CO2 levels rocket up in my house? (In just 4 hours they go from around 500ppm to 1200ppm, and ...
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Leaky Air Duct Sealing
I have duct work in a house that I recently bought were it looks like some ducts were removed and then just sealed over with a metal sheet. The vent seems to be leaking air and in my opinion should be ...
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HVAC return duct near ceiling next to supply duct?
I've owned this home for about a year and this has always intrigued me. My 2-story home has a supply duct nearly pointing at a return duct in the center of the hall upstairs.
Two questions:
Would hot ...
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How can I prevent fiberglass duct insulation from being blown into my living space?
For no explainable reasons (there are other materials that are not health hazard which provide sound insulation), manufacturers put fiberglass in the register boxes. I moved into a new, old, apartment....
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Cold air blows through supply vent when furnace is off
I have separate units for 2 floors. On 2nd floor , out of 3 room and big loft area only 2 rooms are always cold (like 55 degree during winter) when doors are closed.
These rooms have 2 supply vents ...
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HVAC air filter replacement interval in hours?
My condo has a central heat pump AC/heater system that takes a 20x30x1 air filter. My area is a very mild climate and the HVAC system rarely gets run.
Checking my usage data over the past 12 months, ...
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Forced Air Unit will not go off
My forced air unit never goes off. It comes on intermittingly all day and night. I have a FAU switch in my breaker box and I have turned it off, but the forced air unit still runs day and night. I ...
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How to fix a crushed A/C duct
One of my kids got into the attic and walked all over my 7" aluminum (?) round ducts. See the picture below. I found this post, but that's a different type of duct.
My idea is to drill a hole and ...
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Cold air coming out from intake after A/C turns off
When my A/C compressor turns off, the air handler seems to go into an almost idle state where it still sounds like it’s on but not running on full power. During this time, cold air is constantly ...
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Is it possible to adapt round HVAC diffusers to square?
I am working on a remodel in my older home. Currently all of the HVAC is run through sheet metal ceiling ducts, most of which are 8" diameter, and then when they reach the rooms, flair out to a ...
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Carrier HVAC System with Variable Speed Motor burned out after 6 months
I just recently purchased a Carrier Hvac 3 ton heat pump system back in February of this year. The heat pump has a variable speed fan that just burned out. Is this common? This is a new system and it ...
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Single or two-stage replacement in two zone system
Need to replace an 18 year old single stage, two zoned furnace/AC installed in my converted attic in Chicago. It's in the knee wall and serves the attic and the second floor. Air returns on both ...
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Should registers have gray duct sealant
Should the internals of a register where connections are made have gray duct sealant?
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Why would part of my second floor not have any HVAC airflow?
I recently moved into a townhouse and found that on the 2nd floor, 2 rooms and bath doen't have airflow at all( no ac or heating).
First tried with insurance company guys and he removed 1 damper which ...
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Low refrigerant pressure on AC - tech recommends replacing evaporator coil?
So this is a follow-up to my previous AC tech horror story: Rust on outdoor ac fan motor? Tech recommends replacement? . I got a new AC tech from a small two-tech company with glowing reviews, hoping ...
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Does a heat pump have separate unit for heating?
I’m trying to upgrade my current HVAC system. It is a huge unit that looks like this:
I went to the crawl space and I saw some flexible ducts that go to a duct that goes inside the house. So I assume ...
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Our AC isn't cooling to the set temperature
Our AC isn't cooling to the set temperature.
We got one tech from Company-A to come and he said that the Freon is a bit low. So, on hot days, they can't keep up. But our unit has an older R22 Freon, ...
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How to measure current draw of AC condenser fan motor, single phase?
This question is a follow-up from a related question about an AC tech recommending a likely unnecessary fan motor replacement. See Rust on outdoor ac fan motor? Tech recommends replacement?
I'm trying ...
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Rust on outdoor ac fan motor? Tech recommends replacement?
I had my annual ac inspection. House has two units and one runs about twice as long each day as the other because it cools much more of the house, and had its capacitor fail two years ago.
Tech ...
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Identifying VOC sources
I have been racking my brain and searching google to try and figure out the source of the VOCs in my house. I've discovered a few, but they don't quite make sense to me and I'm still confused as to ...
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Pump to push inverter A/C dripping water?
I live on the top floor of the building and my bedroom has an inverter A/C that naturally drips water to the street. The bedroom has access to the roof.
Is there some inexpensive pump that will push ...
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Possible to "soundproof"/reduce noise from First Floor Furnace/AC?
We have a 1080 sq. ft., 1-floor (no basement) house. Our furnace and cold air/AC returns/registers are literally almost in the living room/main sitting area and it's very loud year round, making for a ...
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When adding an air return to the basement for the sake of habitable space, what considerations should I be making?
I am currently planning to create a finished office space in my basement. I understand that habitable spaces require service from both supply and return air. The house, ~2000sqft over 2 habitable ...
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How to get good HVAC quotes?
My natural gas furnace and air conditioner are 20 years old. I plan to gather quotes to replace them both. What do I need to do so that I get good quotes?
I've heard HVAC contractors talk in an online ...
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How do I fix a loud intake vent?
In the master bedroom, there is one of four intake vents in the house, and this particular one is very loud.
Our house has two vertical air shafts that run parallel to each other, one for supply and ...
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One room is always the hottest in the house
Whether it's winter or summer, hot or cold outside, my bedroom is always the hottest in the house. I have taken temperature readings and the air temperature can exceed 85 degrees. I have a fan almost ...
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Will rigid air conduit improve flow, over flexible ones
My top room (3rd floor) has poor airflow, from a central air (cool and heat). Looking in the attic, I found flexible ducts that go over many curves. I feel like the duct are getting compressed/bent at ...
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AC unit don't work right now and it's hooked up to the main breaker before it goes into breaker box is this okay it was done in 1959
Okay the AC quit working and I never did find a throat breaker go out by the AC unit in the box on the wall is sizzling I follow the line all the way back to where it hooks up to the line that is ...
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Can a HVAC be split between bonus room and garage, but with return and Tstat in bonus room?
I have an insulated garage and bonus room above it. Can a HVAC feed both the bonus room and garage, but the bonus room have the air return and Tstat? The bonus room is accessible from inside the house,...
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Central A/C Draining Causing Stagnant Water - Dry Well?
I have a central air system with a condensate drain line that exits my home near the actual AC compressor on the side of my house. The original installers put in a cement cylinder that the line ...
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What is the best method and tool to detect harmful non-carbon-monoixde gases?
I recently cleaned my home's air filters and discovered a significant increase in well-being.
Previously, staying at home during the weekend for more than 1-2 hours resulted in fatigue and dizziness,
...
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How can I make a finished attic cooler and all bedrooms comfortable when central A/C is shared between 2nd and 3rd floors?
I have a 3-floor house with central air. First floor has its own A/C. Second floor and finished attic are a single zone. There is an open staircase between the first and second floors, and a ...
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Should I upgrade my evaporator coil when a I get a new furnace?
We are about to start adding a 400 sq feet addition to our just purchased to-be rental property that is 1000 sq feet, so 1400 sq ft. total. The property is in NE Ohio, so we get heavy snow and cold ...
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What was this doing on my return air vent and why did it prevent installation of a filter?
We purchased a new home a little over three months ago. It had a rooftop AC unit installed in probably the late 90s/early 2000s. We were unable to have this tested during our inspection because the ...
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How to balance pressure in a multi-zone damper hvac with an always on bypass valve
Background
I'm the new owner of a multi-family home where the previous owner was a large corporation that made money by overspending on renovations. Thus, they tended to renovate with top-tier ...
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