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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25 views

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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30 views

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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1answer
127 views

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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62 views

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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1answer
50 views

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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42 views

Installing a larger HVAC blower motor

Recently our A/C started severely underperforming. The culprit turned out to be a clogged condensate line which leaked through the unit and deposited a gallon of water into the blower housing. After ...
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1answer
53 views

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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2answers
39 views

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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3answers
132 views

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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2answers
95 views

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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39 views

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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90 views

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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67 views

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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71 views

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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3answers
63 views

When would you want/have/need to put in a post filter in an electrostatic air filter system?

The HVAC system has an Electrostatic air cleaning system and it uses a prefilter and has a slot for a post filter. I've been reading online that only the prefilter is good enough to get the job done ...
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1answer
40 views

AC troubleshooting

I’m suspecting an upcoming issue with my split AC system. Currently it is working and cooling, however in the last week or so, I’ve noticed that after the AC reaches the set temp, the copper line ...
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2answers
190 views

Is it ok to blow hot air under the floor?

I have two story house and downstairs is always colder. Head feels fine but feet are cold and you can feel cold coming from the floor. The house have no basement but is built on a concrete slab. The ...
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1answer
87 views

How does high static ductwork ( Mobile home) affect AC Seer rating?

I was told that mobile home ductwork affects the seer rating of central air units. So if a 13/14 seer or higher is installed what is the usual seer rating if installed in a mobile home? I was also ...
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1answer
164 views

Can a single 8" flex duct be split into a 5" flex and 7" flex?

Our house used to have a fur-down A/C unit that fed a series of rigid ducts made with duct board. We'd like to replace a vent in our bathroom (5' x 11') with a 5" flex duct. We'd like to ...
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1answer
132 views

What is a "solar-ready" air conditioner?

I've been looking into having solar panels installed. My understanding is that the solar panels connect to a breaker in the breaker panel, and so you have both the main breaker (from the power ...
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2answers
440 views

Electrical outlet above HVAC air return, within same wall cavity

Q: Is an outlet above the HVAC air return considered within the environmental air space? We need to move the HVAC air return in one of our rooms, and there is an existing electrical outlet in the most ...
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1answer
32 views

Adding C Wire as simple as C to C?

Short version: I ran a new 2-strand wire from my thermostat to the furnace/air handler unit to provide spare wires since the existing 5 wires are used up and I need a C. Is hooking up the C wire as ...
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40 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
105 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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2answers
159 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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55 views

Central a/c intake seems to let hot air in from attic. Is this on purpose?

We live in the desert where it's quite hot. We have a 2 story with central a/c with seperate units for bottom and top floors. While the a/c was off i noticed what felt like hot air from the second ...
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1answer
34 views

Air Flow using Vacuum and High Air Pressure Air

I am investigating container homes. Something about the modularity appeals to me. Regardless, I am thinking about one of the challenges that they face is to get adequate air flow without cutting ...
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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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1answer
23 views

Air Conditioner - water standing in condenser housing

After clearing out the overflow pipe, I still had a problem because water has started dripping in places not directly over the drain pan. I "extended" the coverage with sheet metal, but the ...
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1answer
45 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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2answers
86 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
145 views

Does lengthy refrigerant line between indoor and outdoor unit affect AC performance and result in higher utility bill?

As part of basement renovation, I am moving the HVAC indoor unit for about 30 feet, which means the refrigerant line has to be extended by same length concealed within basement ceiling. Now, I have ...
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1answer
46 views

My HVAC A/C is freezing after sundown every day

I recently replaced the capacitor on my external A/C unit. After replacement it started back up and was working fine for day or two but for the last 4 days it has been freezing up every single night ...
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1answer
105 views

Relocating central air conditioner coolant supply line

I have a central air conditioner installed in the attic with the supply line running down the back of the house and into the condenser. What I wanted to know if I can move the condenser onto the side ...
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1answer
773 views

Evaporator Coil Cold, but Not Ice Cold

My temperature difference between my supplies and returns is only around 5 degrees F. I opened up my air handler to see if the evaporator coil was dirty, and it was clean -- but running the outside ...
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2answers
205 views

Redirecting cold air from a floor-vent to ceiling

The bedroom on the third floor of my house has floor one floor vent for supply and one for return. In the summer, the central AC works extra hard but yet the bedroom is only about 75% cool compared to ...
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0answers
42 views

Replacing Central air with a Split system

I'm trying to replace two central Air conditioners (one per each floor. 2-3 ton each) in my home and I'm not sure if I should go with Ductless (because of a much lower cost) or pay higher and replace ...
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1answer
179 views

what are pros and cons of an air handler located in cooled space?

The air handler unit on my central air conditioning system in Florida is located in a closet that opens to the attic. The air handler is exposed to the attic temperatures (hot) which seems counter ...
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1answer
963 views

Flex-duct as a Trunk?

From my A/C supply plenum, I will have a trunk (approx 20ft straight run) with 3 branches coming off (each about 2 ft runs). This 20ft straight run would be perfect for a large flexible duct, and ...
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1answer
99 views

How to stop Central Air unit from freezing over inside and outside

Today I noticed the AC wasn't working. I checked the unit outside and saw the line freezing. I checked inside and it's frozen as well. I turned the AC off and fan on. The ice is melting now. I ...
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3answers
123 views

Furnace intake on both floors

I have a furnace located in my basement in a small enclosed room. I also have a large vent upstairs above this room in my kitchen. I always thought that the furnace takes the air from the kitchen ...
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10answers
6k views

Time to Replace Central AC?

Have a 2004, Rheem, Model #: RAMC-048JBZ; R-22 refrigerant. We live in Central Texas, very hot 5 months a year, we use the AC probably 7/8 months a year. Have had annual maintenance performed since ...
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2answers
71 views

Relocate central air conditioners to roof

We recently moved into a house, and we've noticed that the central air conditioners take up valuable space, not only with their footprint, but also they will likely blow hot air during use, making ...
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1answer
322 views

Tobacco smoke smell from utility closet

I'm in a condo with neighbors on both sides. utility closet is in the basement. It smells like old stale cigarette smoke in my utility closet, like somebody has been smoking cigarettes in there for ...
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33 views

FAU Removal and Storage

I'm looking to move my FAU in a few months to the attic, but right now I need it moved out of my basement for a remodel. Can an FAU be stored in this manner for short term? Logic leads me to think so, ...
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1answer
1k views

How do I wire a/c if furnace wiring compartment has no y terminal?

I have been trying to figure this out for more than a year. All was running until HVAC company came to replace 2 thermostats with nest and rewired 2 HVAC units (a front of house and a back of house ...
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2answers
100 views

How can I use a pre-installed A/C unit for heat?

I just bought a house with a relatively two-year old A/C unit (installed 2018) and a natural gas furnace connected to central air. I'm interested in using the A/C unit as to heat the air in lieu of ...
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788 views

Seal old ductboard from inside with duct mastic?

For the next few days, I have what appears to be an opportunity to easily and cheaply make a small improvement to the overall airtightness (or nearly complete lack thereof) of my house's 40 year old ...
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43 views

Environmentally friendly methods for heating a large addition

I live in Southern California, and am writing this at my desk in the large family room, which is about 45 sq.m. (500 sq.ft.). This room was added on to the house, and our natural gas furnace doesn't ...
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2answers
1k views

Why is the paint around my ceiling air vent discolored?

What is this pattern of discoloration around my ceiling AC supply vent, and how can I stop it from happening again if I repaint? Background: In September 2016, I had an air conditioning system ...