Do you have to vent all portable air conditioners out a window?

• <div><p>No. With a ventless portable AC system, you don’t need to vent anything out the window—but it will be harder to circulate the hot air from the room without one, so you’ll need to come up with another solution, like placing a fan near a warm spot and facing it towards and open water to push the hot air out.</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>

Is it better to repair an AC or replace it?

• <div><p>Repairing an AC unit is usually more cost-effective than replacing it, but you should consider the age of your system. Most central AC units last around <b>15 years</b>, and window units last for between eight and 10 years. If your central AC is more than 10 years old or your window AC is over six years old, you should consider <a href="https://www.angi.com/articles/it-time-repair-or-replace-my-air-conditioner.htm">replacing the AC unit</a> rather than repairing it. The repair will fix your issue, but you’ll likely save money in the long run by replacing it rather than repairing it only to replace it a few years later.</p></div>

Top-rated heating and air conditioning pros.

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TRUSTED BY KNOXVILLE, PA HOMEOWNERS

4.2
Average homeowner rating
46
Verified heating and air conditioning services reviews

Verified Reviews for Heating And Air Conditioning Service pros in Knoxville, PA

*The Angi rating for Heating And Air Conditioning Service companies in Knoxville, PA 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 Knoxville, PA 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 November 12, 2025

Reviewed in January 2025
Otto is excellent. He came out to replace my water heater. He is reasonably priced, professional and easy to talk to. I will definitely be calling him back when I am ready for more work that needs done.
Pipe & Power
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Reviewed in August 2024
Dominic Noble was excellent to install our new furnace and air conditioning system. He was very professional and wonderful to talk to. He was very competitive with his prices and took pride in doing the work to the highest standards. I would highly recommend him to others.
Noble Heating and Cooling, LLC
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Reviewed in June 2024
Matt installed a new ac for us in a very timely manner. He got us a bid the same day he came out to look at our old unit. The install was quick and seamless. Good price, quality work. I definitely recommend him for all of our family and friends.
Stadelman Service and Installation
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Reviewed in January 2024
charged 500.00 labor for 1 hour and 20 minutes of simple installaion/replacement of water heater.
Cummings Plumbing & Excavating
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Reviewed in July 2022
He was a very nice you man. He found the problem quickly and and the work was done quickly. He came on a very hot Saturday afternoon. I was very happy with the work. and that I got the Air conditioning was fixed!
Hammer Heating & Air Conditioning
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Reviewed in August 2016
I would highly recommend Gosnell Heating for any residential heating or cooling system install or maintenance. Todd Gosnell installed my HVAC system in my home back in 2013, and has returned for annual check-ups since then. They are professional, responsive and very cost competitive- if you are...
GOSNELL HEATING
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Reviewed in September 2014
As above. A new electric furnace was installed, along with an air conditioner additional duct work and pipes had to be replaced and extended to the back bedrooms. Jay and fellow workers went out of their way to make sure we were satisfied with the work and met our needs. They were...
Jed Heating & Cooling Inc
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Reviewed in April 2013
They were very professional and easy to work with. They were here every day at the same time, and worked continuously until the whole job was done. They installed the air conditioning system in the attic, ductwork from the attic down through closets, installing air conditioning vents in the...
BUCHANAN-SUSICK HEATING & AC
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Reviewed in May 2012
Once when we had not moved in yet, we came to see how things were going and had no hot water. He came at 10 pm at night to fix the water heater. Extremely satisfied with his work.
Savage Plumbing and Heating
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Reviewed in July 2011
My AC unit stopped working and I had called a company that I saw advertised on TV. The company that came out first, the one from TV, said the AC unit was too old and wasn't repairable and needed replaced. I then called Gillock Heating and AC. They not only came the same day that I called,...
GILLOCK HEATING & AIR COND
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Find Heating and air conditioning pros in Knoxville

PC Heating & Cooling

4.68(

)

•Approved Pro

PC Heating & Cooling

4.68(

)

•Approved Pro

Customers say: Quality work

80 local quotes requested

14 years of experience

Our mission at PC Heating & Cooling, is to continue the growth of our business by doing right by all our clients. We love seeing that one of a kind smile on a home owners face at the end of a project! PC Heating & Cooling stacks up with the competition and surpasses it with competitive prices, second to none workmanship and a prompt/responsive team! We give you quality that you can measure, and a finished product that will enhance your home forever. From winter's chill through the dog days of summer, we will keep your home comfortable for you and your family. But, that's just the beginning. We also offer you peace of mind, ensuring your equipment operates safely. We help you save money on your fuel bills, and, we help deliver relief to those with allergies and many others concerned with the quality of the air they breathe.

"I was very impressed with the quality of work he provided, and explained in detail the work he had done to my unit. He was very respectable and professional.. I definitely will be recommending his company to family and friends "

Mary M on April 2025

"I was very impressed with the quality of work he provided, and explained in detail the work he had done to my unit. He was very respectable and professional.. I definitely will be recommending his company to family and friends "

Mary M on April 2025

T. Roe Electrical LLC

No reviews yet

T. Roe Electrical LLC

No reviews yet

6 years of experience

At T. Roe Electrical, we take pride in providing reliable, top-quality electrical services to residential and commercial customers. As a veteran-owned and operated business, we're also pleased to offer plumbing, HVAC, and general contracting services, so you can keep your home in top shape with just one call. We are dedicated to delivering excellent workmanship and customer service with every project. Contact us today to learn more!

HOME SERVICES

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HOME SERVICES

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QUALITY HVAC REPAIRS AND INSTALLATIONS! * Licensed and Experienced Technicians * Affordable Rates * 24/7 Emergency Repairs AIR CONDITION & HEATING * All Types of AC Systems Install/Repair * Maintenance and Tune-Up Heat Pumps, * Air Handlers, * Gas/Electric Furnaces, and Mini Splits * and more. Just ask us!

TD ENERGY EXPERTS, LLC

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TD ENERGY EXPERTS, LLC

No reviews yet

7 years of experience

TD Energy Experts, LLC. is a full service Mitsubishi Ductless Heating and Cooling Diamond Contractor. With TD all of our customers receive a 12 yr Compressor/Parts and 12 yr labor warranty. That's one reason our customers choose to do business with us "Why settle for a field goal when you get a TD with TD Energy Experts"!

Gater Mechanical LLC

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Gater Mechanical LLC

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Free onsite estimate

Gater Mechanical LLC is a reliable and professional HVAC Contractor in Newville, PA. If you need HVAC Repair or any other HVAC Service, this is your company ! Visit our website or call us now at (717) 696-6087 ! Bloserville, PA; Entlerville, PA;Plainfield, PA; Carlisle, PA; Newville,PA

American Home Guard Home Warranty - PA

5.00(

)

American Home Guard Home Warranty - PA

5.00(

)

Customers say: Quick response

Recommended by 100% of Angi customers

American Home Guard is America’s top rated home warranty provider. They service home buyers and sellers across the nation.They offer home warranty service plans for single family homes, multiple units, condos, and even mobile and manufactured homes. They are proud to offer their referral and realtor programs as well as enticing rates to multiple property owners.

Raker Builders Co

No reviews yet

Raker Builders Co

No reviews yet

30 years of experience

Full Service Contractor

ADDTL ADDRESS: PO BOX 39, CHAMBERSBURG, PA 17201.

"THE WORST COMPANY I have ever delt with. The repair lasted for 17 days and then they refused to come out and fix the problem on a system they had installed that would have still been under warranty if I was the original owner. I told them I wasn't going to pay so the charged an old credit card on file. STAY AWAY FROM THIS COMPANY !!!"

Chris D on April 2025

ADDTL ADDRESS: PO BOX 39, CHAMBERSBURG, PA 17201.

"THE WORST COMPANY I have ever delt with. The repair lasted for 17 days and then they refused to come out and fix the problem on a system they had installed that would have still been under warranty if I was the original owner. I told them I wasn't going to pay so the charged an old credit card on file. STAY AWAY FROM THIS COMPANY !!!"

Chris D on April 2025

Abma's Heating & Cooling

1.00(

)

Abma's Heating & Cooling

1.00(

)

We are a one-stop destination for all your heating and cooling requirements. From installation and repair to maintenance and replacement, you can depend on us for all your heating and cooling needs. Offering everything under one roof makes it possible for you to depend on us for all your heating and cooling needs. We strive to exceed the expectations of our clients by working with integrity, competence, and objectivity, and want to emerge as the benchmark for heating and cooling services We specialize in everything from repair to new installation and are a one-stop service provider for all your heating and cooling needs.

"We had Abma come out to fix our AC unit this summer. They charged us over $400 to get it running. A week later the unit stopped working again. They came back out to look at it and said the unit needed to be replaced. Now, four months later, we get a $90 bill for the second visit. After talking to them, there was no compromise on the second charge. Horrible customer service."

Thomas N on November 2021

"We had Abma come out to fix our AC unit this summer. They charged us over $400 to get it running. A week later the unit stopped working again. They came back out to look at it and said the unit needed to be replaced. Now, four months later, we get a $90 bill for the second visit. After talking to them, there was no compromise on the second charge. Horrible customer service."

Thomas N on November 2021

...

Showing 1-10 of 79

Heating and Air Conditioning questions, answered by experts

No. With a ventless portable AC system, you don’t need to vent anything out the window—but it will be harder to circulate the hot air from the room without one, so you’ll need to come up with another solution, like placing a fan near a warm spot and facing it towards and open water to push the hot air out.

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.

Repairing an AC unit is usually more cost-effective than replacing it, but you should consider the age of your system. Most central AC units last around 15 years, and window units last for between eight and 10 years. If your central AC is more than 10 years old or your window AC is over six years old, you should consider replacing the AC unit rather than repairing it. The repair will fix your issue, but you’ll likely save money in the long run by replacing it rather than repairing it only to replace it a few years later.

When your HVAC system is loud, a few different causes are possible. If you have loose connections or bolts in the hardware, they can rattle as the system runs and vibrates. If you have an extremely dirty furnace filter, it could cause the system to generate noise. More commonly, an excessively loud HVAC system indicates a malfunction in the system. You may have a blower motor that is close to failing or a compressor that is breaking down. These issues require an immediate inspection.

HVAC pros recommend that you replace your AC filter every one to three months to maintain optimal indoor air quality and ensure your HVAC system operates efficiently. However, factors such as filter type, household size, and environmental conditions may influence the frequency of replacement. Regular filter changes help prevent debris buildup, maintain airflow, and prolong the life span of your air conditioning unit.

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