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Q: Do window AC units have problems with overcharged refrigerants?

• <div><p>They can, but it&rsquo;s not as common. <a href="https://www.angi.com/articles/troubleshooting-window-ac-problems.htm">Window AC units</a> are much smaller than whole-house systems and less likely to develop refrigerant leaks or similar issues. As a result, you will rarely need to add a new refrigerant, limiting overcharging problems. However, it&rsquo;s still important to leave refrigerant management in the hands of professionals when window units need work.</p></div>

Q: How do I know if my AC needs to be recharged?

• <div><p>There are ways to <a href="https://www.angi.com/articles/detecting-refrigerant-leaks.htm">detect a refrigerant leak</a> with several different testing methods. However, most homeowners can figure out something&rsquo;s wrong with their AC unit by noticing these common signs:</p><ul><li><p>Ice forming on the evaporator coil</p></li><li><p>Water leaks near the AC unit</p></li><li><p>Frequent hissing sounds</p></li><li><p>Increased electric bills</p></li><li><p>Unit takes longer than usual to cool</p></li><li><p>Unit is blowing hot air</p></li></ul><p></p></div>

Q: Does a higher SEER AC cool better?

• <div><p>Because of the improved efficiency, ACs with higher SEER ratings tend to cool down your home better than models with a lower SEER. Higher-SEER AC units have a higher cooling capacity and a lower energy demand, meaning they may help cool your space faster without running up the electricity bill.</p></div>

Q: How do I know if my AC evaporator coil is bad?

• <div><p>Signs of a damaged evaporator coil include warm air from vents, frequent starts and stops without proper cooling, failure to turn on, refrigerant leaks, and unusual noises. If you suspect issues with your AC system or its components, it&rsquo;s best to call an AC repair technician for proper diagnosis and repairs.</p></div>

Q: What happens if you don't clean your AC evaporator coils?

• <div><p>If you don't clean your AC evaporator coils, dirt and debris will build up, which impairs the system's ability to transfer heat. This forces the unit to work harder, leading to inefficient performance, higher energy bills, and frequent breakdowns. Over time, neglected coils can corrode, which may cause refrigerant leaks, or develop mold, ice buildup, and a clogged condensate drain, resulting in poor air quality and an uncomfortable home.</p></div>

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Verified Reviews for Heating And Air Conditioning Service pros in Sumner, ME

*The Angi rating for Heating And Air Conditioning Service companies in Sumner, ME is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Heating And Air Conditioning Service needs.

*The HomeAdvisor rating for Heating And Air Conditioning Service companies in Sumner, ME is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Heating And Air Conditioning Service needs.

Last update on June 30, 2026

Reviewed in June 2026
Josh was very helpful with cleaning and fixing my heat pump. I called him and he came out the next day. He knew what he was talking about and answered all of my questions. The service was great and I got a good price. Thank you.
Northwoods HVAC
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Reviewed in July 2025
Worked hard in the very hot and humid conditions. Very personable and gave me great advice on how to avoid problems in the future.
RM Septic
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Reviewed in June 2025
They were super helpful and the staff was so nice I recommend Able Trades to everyone they installed 2 heat pumps in my home and they are amazing iam so thankfull
Able Trades
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Reviewed in March 2025
The way to go. Future Homes is reliable and great at their craft. Dan and Ryan were a pleasure to conduct business with and were very knowledgeable. Their crew was top of the line, hard workers. They built my place from the ground up. Energy efficient is the way to go! Radiant heat added...
Future Homes USA, Inc.
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Reviewed in February 2024
Northeast heating and cooling was Great to work with and got the job done in a timely fashion and at a great price
NorthEast Heating and Cooling
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Reviewed in December 2023
Joe and his crew were very respectful of my home and they were able repair my heat pump when 2 other companies said that the entire system needed to be replaced. Thank You Comfort Air!
Comfort Air Systems
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Reviewed in October 2023
Derek was prompt, professional, and was able to also service my furnace in addition to the heat pumps. I would most definitely recommend him and will use him again in the future.
D & M Heating
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Reviewed in October 2023
It went very well. Ryan is very knowledgeable and was able to resolve my furnace issue. I will recommend HVAC Solutions 207, LLC for your heating and furnace issues anytime
B&P Handyman Services
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Reviewed in October 2023
My furnace issue was resolved accurately well. I will recommend this company for your heating and air conditioner problems anytime.
HVAC Solutions 207, LLC
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Reviewed in May 2023
Heat pump works great, install went smooth.
Russell's HVAC
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Find Heating and air conditioning pros in Sumner

Northwoods HVAC

5.0(

)

Serving Sumner, ME and surrounding areas

Approved

Free estimates

Warranties offered

Small jobs welcome

"Josh installed a new water heater, provided us with instructions on proper use and maintenance and has serviced it since. He is honest, thorough, and trustworthy. He also maintains my dad’s HVAC needs too. He has come out for emergency calls too. Suggest things to prevent future additional repair expenses. His prices are reasonable, especially for the personal, friendly customer service and service provided. I would highly recommend Northwoods HVAC."

5 neighbors recently requested a quote

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Upfront Home Inspection, LLC

4.9(

)

Serving Sumner, ME and surrounding areas

Approved

In business since 2020

Free estimates

Credit card accepted

"I would highly recommend Upfront Home Inspection, LLC, happy with their work and professional. good job!"

Response time12 hrs

24 neighbors recently requested a quote

Recommended by86%of homeowners

Serving Sumner, ME and surrounding areas

Approved

In business since 2021

Free estimates

Warranties offered

"Extremely professional. They set up heat pumps for my parents and educated them on how to maximize their rebates."

Response time1 day

1 neighbors recently requested a quote

Recommended by85%of homeowners

Serving Sumner, ME and surrounding areas

Approved

In business since 2023

Free estimates

Emergency services offered

"It was late at night when we realized our water heater blew and flooded our basement like a swimming pool. We had to find a plumber and fast. we came across SWB he was out here within 30 minutes from our call the job he did was impeccable. He went above and beyond he went and got us a new water heater, installed it, and then stuck around to help us clean up, Since then we’ve used him for several other projects. Every time the professionalism came with him I would highly recommend him 100%."

New condensate line property piped into existing house sewer to code

Install condensate pump and neutralizer to bring existing boiler upto code.

1 1/2” water mains insulated after we installed them.

+10

Response time1 day

Response rate100%

10 neighbors recently requested a quote

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LaPlante Electric, Inc.

4.2(

)

Serving Sumner, ME and surrounding areas

Approved

In business since 1991

Free estimates

Emergency services offered

"This company did every thing they said they would I would certainly recommend them for heat pump installation . Great job!!"

Response time3 days

Response rate90%

50 neighbors recently requested a quote

Serving Sumner, ME and surrounding areas

Approved

In business since 2023

Free estimates

Credit card accepted

"Nat did a fantastic job. He is the best."

Response time3 hrs

Response rate96%

Recommended by100%of homeowners

Serving Sumner, ME and surrounding areas

Approved

In business since 2005

Free estimates

Warranties offered

"They were super helpful and the staff was so nice I recommend Able Trades to everyone they installed 2 heat pumps in my home and they are amazing iam so thankfull"

Response time1 day

Response rate100%

6 neighbors recently requested a quote

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CAL Plumbing & HVAC LLC

5.0(

)

Serving Sumner, ME and surrounding areas

Approved

Free estimates

Credit card accepted

Offers commercial services

"Caed did a shower replacement for me. It came out really nice and he’s a very nice guy! Highly recommend"

+14

1 neighbors recently requested a quote

Serving Sumner, ME and surrounding areas

Approved

Super Service Award Winner

In business since 2025

Free estimates

Small jobs welcome

"Great communication and timely service. Noah installed a panel for my new spa and wired the whole system up flawlessly. Would not hesitate to recommend or hire for future projects."

Response time9 hrs

Response rate93%

11 neighbors recently requested a quote

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Maine Way Heating and Cooling LLC

5.0(

)

Serving Sumner, ME and surrounding areas

Approved

In business since 2018

Free estimates

Credit card accepted

Request Quote

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Showing 1-10 of 83

Heating and Air Conditioning questions, answered by experts

They can, but it’s not as common. Window AC units are much smaller than whole-house systems and less likely to develop refrigerant leaks or similar issues. As a result, you will rarely need to add a new refrigerant, limiting overcharging problems. However, it’s still important to leave refrigerant management in the hands of professionals when window units need work.

There are ways to detect a refrigerant leak with several different testing methods. However, most homeowners can figure out something’s wrong with their AC unit by noticing these common signs:

Ice forming on the evaporator coil
Water leaks near the AC unit
Frequent hissing sounds
Increased electric bills
Unit takes longer than usual to cool
Unit is blowing hot air

Because of the improved efficiency, ACs with higher SEER ratings tend to cool down your home better than models with a lower SEER. Higher-SEER AC units have a higher cooling capacity and a lower energy demand, meaning they may help cool your space faster without running up the electricity bill.

Signs of a damaged evaporator coil include warm air from vents, frequent starts and stops without proper cooling, failure to turn on, refrigerant leaks, and unusual noises. If you suspect issues with your AC system or its components, it’s best to call an AC repair technician for proper diagnosis and repairs.

If you don't clean your AC evaporator coils, dirt and debris will build up, which impairs the system's ability to transfer heat. This forces the unit to work harder, leading to inefficient performance, higher energy bills, and frequent breakdowns. Over time, neglected coils can corrode, which may cause refrigerant leaks, or develop mold, ice buildup, and a clogged condensate drain, resulting in poor air quality and an uncomfortable home.

The Sumner, ME homeowners’ guide to heating and air conditioning services

From average costs to expert advice, get all the answers you need to get your job done.

See all articles

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