What is the most common rule used for HVAC load calculation?

• <div><p>A common HVAC rule is that for every 500 to 600 square feet of living space, you need 1 ton of heating or cooling capacity. Now that you know this common rule, you also need to know that it isn’t very accurate, and a dedicated pro wouldn’t use it for your home. If you talk to a pro who won’t or can’t perform a proper Manual J calculation, consider hiring someone more thorough.</p></div>

How long should my HVAC last?

• <div><p>With the proper maintenance and repairs, your HVAC can last <b>15 to 25 years</b>. However, it depends on the type of equipment you have and the average lifespan of each, including:</p><ul><li><p><a href="https://www.angi.com/articles/oil-furnace-replacement-cost.htm">Oil furnace</a>: <b>10–15 years</b></p></li><li><p><a href="https://www.angi.com/articles/common-gas-furnace-prices.htm">Gas furnace</a>: <b>20–30 years</b></p></li><li><p><a href="https://www.angi.com/articles/how-much-does-boiler-installation-cost.htm">Boiler</a>: <b>20–35 years</b></p></li><li><p><a href="https://www.angi.com/articles/how-much-does-installing-new-ac-cost.htm">AC unit</a>: <b>7–20 years (location dependent)</b></p></li><li><p><a href="https://www.angi.com/articles/heat-pump-systems-explained.htm">Heat pump</a>: <b>10–20 years</b></p></li><li><p><a href="https://www.angi.com/articles/how-ductless-mini-split-heat-pump-works.htm">Ductless mini-split</a>: <b>10–30 years</b></p></li></ul><p></p></div>

Is it better to have an AC unit on the roof or ground?

• <div><p>The decision to put your AC unit on the roof or ground depends on the climate in your area, the roof shape, accessibility, and budget. If you live in a warm climate or don’t have existing ductwork, it’s likely best to stick to a traditional AC unit that sits on the ground. However, if you lack yard space, live in a mild climate, and have easy access to the roof, your home may benefit from a rooftop AC unit. </p></div>

Can I still use my AC if it’s leaking water?

• <div><p>A few drips here and there should not be cause for concern, but if your unit is leaking a large amount of water, then it’s advised that you stop using it until the problem is identified and a solution is determined. The more you use it during a leak, the more issues it will cause. </p></div>

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Last update on November 27, 2025

Reviewed in June 2025
Stacy repaired my A/C unit and did a checkup on my system. He did an outstanding job and will be using him in the future.
KITE HEATING & AIR CONDITIONING
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Reviewed in June 2024
Repaired my ac and is working fine
Evans Heating And Cooling, LLC
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Reviewed in June 2022
They came quickly and fixed it quickly. The man was very nice and friendly. He knew what he was doing and got my AC up and running very quickly. The price was reasonable. Anything else goes wrong with my AC I am calling A & D Heating and Air Conditioning for sure. I could not ask for better...
3C Mechanical Technologies, Inc.
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Reviewed in January 2020
Neal was very responsive, punctual and paid attention to detail. He educated me on the differences in various qualities of radiant barrier and on the value of using high quality. He also went so far as to tell me where not to install additional insulation as it would be a waste of money. He...
Affordable Radiant Barrier
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Reviewed in March 2015
I like them and have used them in the past as well. They've done excellent work and are very detailed in their checks for the heating and A/C units. I always go with them and ask questions, which they are very good about explaining everything to me.
Reliant Air Conditioning
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Reviewed in August 2014
Matt is an excellent technician, who is punctual, polite and professional!! I am an RN, so I got a kick out of his "description of work"; they read like well-thought nurse's notes. I will always call Ed Johnson's A/C and Heating!
A Degree Above Heating and Air
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Reviewed in January 2014
We are relatively new to the area and word of mouth recommendations give us a point of reference for services when searching Angie's List. It seem that everyone has a 'guy' for something; I now have a guy I will go to for all my HVAC needs. Danny Redona was professional, had time for all my...
SO COOL
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Reviewed in January 2014
Charged me for a service that failed in 6 days and told me it would be an additonal $2500.00 for further repair. Did not do a leak check! on A/C.
Wright's Air Conditioning, Inc.
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Reviewed in January 2014
It was it the heat of the summer when the A/C went out. After it was fixed by Ken Parker Services we found out that they GOUGED us on the cost of the freon. They charged us $50 a lb and we since found out that most other services charge half that cost. We feel like the took advantage of me (a...
Ken Parker Service, Inc.
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Reviewed in March 2013
Replaced entire a/c and heating system; temperature was down below 20 degrees f and electric furnace would not work, He installed a new unit the next day and we are completely satisfied with the unit including the price. The new installed unit is a 4 ton trane with heat pump and electric...
FORBES AIR CONDITIONING & HTG
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Sentri Homes

Sentri Homes

easy simple solar

easy simple solar

Ultimate Plumbing Heating And Air Conditioning

Ultimate Plumbing Heating And Air Conditioning

Advanced Construction Enterprise 1, LLC

Advanced Construction Enterprise 1, LLC

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Spearman Automotive

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Shur-Flow Services

Rocky’s AC and Heating

Rocky’s AC and Heating

Allen Christopher HVAC

Allen Christopher HVAC

Ashley Heating & Air Conditioning / Refrigeration

Ashley Heating & Air Conditioning / Refrigeration

Krell Distributing Co Inc

Krell Distributing Co Inc

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