Get matched with top window a/c unit installers in your area
Enter your zip and get matched with up to 3 pros
Matching on HomeAdvisor
Window a/c unit installers in Littleton
Cornell's Brothers is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty and responsibility in all of our jobs. We are a locally owned and operated business with more than 15 years of experience serving Lakewood, CO and surrounding areas. There is no job too big, or too small for our team. Call today...
Cornell's Brothers is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty and responsibility in all of our jobs. We are a locally owned and operated business with more than 15 years of experience serving Lakewood, CO and surrounding areas. There is no job too big, or too small for our team. Call today...
We provide our clients with the very best in installation, service, and repair for your heating and cooling needs. Our company is built on honesty and integrity. We specialize in central A/C and cooling systems, as well as heating and furnace systems. We take pride in the quality of our work and our commitment to outstanding results. We look forward to building long-term relationships with our clients, and guarantee your satisfaction.
"Devin was so professional and knowledgeable. Great company and service!! Highly recommend."
James M on May 2020
We provide our clients with the very best in installation, service, and repair for your heating and cooling needs. Our company is built on honesty and integrity. We specialize in central A/C and cooling systems, as well as heating and furnace systems. We take pride in the quality of our work and our commitment to outstanding results. We look forward to building long-term relationships with our clients, and guarantee your satisfaction.
"Devin was so professional and knowledgeable. Great company and service!! Highly recommend."
James M on May 2020
At 5280 Cooling, Heating & Refrigeration, we specialize in fast, affordable, and reliable HVAC repairs, installations, and tune-ups across Lakewood, Westminster, and Aurora, Colorado. Whether your system needs a quick fix, a full replacement, or a seasonal check-up, our licensed HVAC technicians are here to keep your home or business comfortable year-round. 5280 Cooling, Heating & Refrigeration is a family-owned and operated company of Colorado natives. We have been doing business In Colorado since 2008, and have over 4 decades of experience in the trade. Our company has a Master Mechanical license, as well as two supervisors’ licenses, and we offer a full spectrum of services. From Commercial and Residential HVAC services to Commercial Refrigeration, we can handle it all. We take pride in our work and strive to make sure that every job, no matter how big or small, is done right the first time.
"This team of guys are some of the best in Town. Time responsive, clean, and appreciative to help. I?ve used this team for several years with no complaints!!"
Brian J on May 2025
At 5280 Cooling, Heating & Refrigeration, we specialize in fast, affordable, and reliable HVAC repairs, installations, and tune-ups across Lakewood, Westminster, and Aurora, Colorado. Whether your system needs a quick fix, a full replacement, or a seasonal check-up, our licensed HVAC technicians are here to keep your home or business comfortable year-round. 5280 Cooling, Heating & Refrigeration is a family-owned and operated company of Colorado natives. We have been doing business In Colorado since 2008, and have over 4 decades of experience in the trade. Our company has a Master Mechanical license, as well as two supervisors’ licenses, and we offer a full spectrum of services. From Commercial and Residential HVAC services to Commercial Refrigeration, we can handle it all. We take pride in our work and strive to make sure that every job, no matter how big or small, is done right the first time.
"This team of guys are some of the best in Town. Time responsive, clean, and appreciative to help. I?ve used this team for several years with no complaints!!"
Brian J on May 2025
When you hire our handyman company for your homes next project, youre doing exactly that: hiring a whole team. Were more than just one handyman. Our handyman service company is composed of trusted, screened, and qualified home service professionals with an average of 10 years of experience completing home-related projects. We approach things as a team for a more efficient customer experience! When you need home repairs or other home improvement projects completed in Englewood, turn to Mr. Handyman of Englewood, Centennial and S Aurora for help!
"Great work, even in the heat he took his time to do quality repairs."
Spencer W on July 2024
When you hire our handyman company for your homes next project, youre doing exactly that: hiring a whole team. Were more than just one handyman. Our handyman service company is composed of trusted, screened, and qualified home service professionals with an average of 10 years of experience completing home-related projects. We approach things as a team for a more efficient customer experience! When you need home repairs or other home improvement projects completed in Englewood, turn to Mr. Handyman of Englewood, Centennial and S Aurora for help!
"Great work, even in the heat he took his time to do quality repairs."
Spencer W on July 2024
In Business Since 2024 Otter HVAC Solutions is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business. How We Got Started I chose to work in this industry because Hi there— I’m Mitch Atwell, HVAC and Boiler Technician with over 15 years experience installing and repairing systems. I’m also an Eagle Scout! I’ve worked at all levels of the industry and can help you make the best decisions for your home. I’m here to help you keep the heat on, get some AC, and make your life more comfortable for a comfortable price. Please reach out with any questions!. We started in this industry in 2012. We describe our business as Family owned and operated
"Mitch had it all planned out and was in and out. We now have endless hot water!"
Brad l on February 2025
In Business Since 2024 Otter HVAC Solutions is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business. How We Got Started I chose to work in this industry because Hi there— I’m Mitch Atwell, HVAC and Boiler Technician with over 15 years experience installing and repairing systems. I’m also an Eagle Scout! I’ve worked at all levels of the industry and can help you make the best decisions for your home. I’m here to help you keep the heat on, get some AC, and make your life more comfortable for a comfortable price. Please reach out with any questions!. We started in this industry in 2012. We describe our business as Family owned and operated
"Mitch had it all planned out and was in and out. We now have endless hot water!"
Brad l on February 2025
Behold the Difference! Every day we are invited into our customer’s homes. Into their safe place and sanctuary. Quite often this is in the midst of a concern or issue that needs to be fixed! With an extensive background that spans well beyond just the trades, we love to be different. In addition to decades of industry experience, we bring some secret sauce - we love to take all the time needed to help, to make sure you are comfortable, and to provide amazing solutions. Come BEHOLD the difference! "Unfortunately we do not service or intall swamp or evaporative coolers".
"All of the guys of the “Behold” crew were fantastic! Bryan was super patient, kind and informative, and the rest of the guys were nice, good at what they did and hard working! Really, the whole experience was lovely. The install took them a long time as our house is weird and has many corners so they ended up working a 14 hour day- but no one complained, and even still cleaned up ( in the dark). Would recommend a 100%."
Ellie R on April 2025
Behold the Difference! Every day we are invited into our customer’s homes. Into their safe place and sanctuary. Quite often this is in the midst of a concern or issue that needs to be fixed! With an extensive background that spans well beyond just the trades, we love to be different. In addition to decades of industry experience, we bring some secret sauce - we love to take all the time needed to help, to make sure you are comfortable, and to provide amazing solutions. Come BEHOLD the difference! "Unfortunately we do not service or intall swamp or evaporative coolers".
"All of the guys of the “Behold” crew were fantastic! Bryan was super patient, kind and informative, and the rest of the guys were nice, good at what they did and hard working! Really, the whole experience was lovely. The install took them a long time as our house is weird and has many corners so they ended up working a 14 hour day- but no one complained, and even still cleaned up ( in the dark). Would recommend a 100%."
Ellie R on April 2025
Mendoza’s is here to cater to your property projects including Deck Building/repair, bathroom remodels, general remodels, plumbing, concrete, indoor and outdoor painting, fencing, etc. We have provided quality and honest work for 15+ years and continue to impress customers and their needs. Mendoza’s is an honest business who will give you affordable prices but fair to my quality of work. I will provide knowledge and advise for your projects. You can contact Mendoza’s at 720-429-9432 and begin your projects today! Antonio Mendoza Owner
Mendoza’s is here to cater to your property projects including Deck Building/repair, bathroom remodels, general remodels, plumbing, concrete, indoor and outdoor painting, fencing, etc. We have provided quality and honest work for 15+ years and continue to impress customers and their needs. Mendoza’s is an honest business who will give you affordable prices but fair to my quality of work. I will provide knowledge and advise for your projects. You can contact Mendoza’s at 720-429-9432 and begin your projects today! Antonio Mendoza Owner
At NRWillis Construction, we offer a wide range of handyman services to ensure your home or business stays in top shape. Whether it’s minor repairs, installations, or maintenance tasks, our experienced team is here to handle it all with precision and care. From carpentry and plumbing to painting and electrical work, no job is too small or too big for us. We pride ourselves on delivering quality craftsmanship, timely service, and solutions tailored to your specific needs. Trust NRWillis Construction for reliable and efficient handyman services that keep your property running smoothly.
"Excellent work, friendly people!"
Katherine E on April 2025
At NRWillis Construction, we offer a wide range of handyman services to ensure your home or business stays in top shape. Whether it’s minor repairs, installations, or maintenance tasks, our experienced team is here to handle it all with precision and care. From carpentry and plumbing to painting and electrical work, no job is too small or too big for us. We pride ourselves on delivering quality craftsmanship, timely service, and solutions tailored to your specific needs. Trust NRWillis Construction for reliable and efficient handyman services that keep your property running smoothly.
"Excellent work, friendly people!"
Katherine E on April 2025
If you have any plumbing, heating, cooling or electrical issues at all, contact the experts at High 5 today. We are highly experienced and extensively trained. Using state-of-the-art equipment and a comprehensive understanding of plumbing and HVAC, we handle all of your needs in a timely and professional manner. Whether you need to install, repair, or replace piping, unclog a toilet, replace your ceiling fan, repair an electrical box, install a new air conditioner, need furnace maintenance, or more, they can handle it quickly and efficiently. With High 5, you can count on their expert plumbers, electricians, and HVAC technicians to show up as at your home on time and ready to work. We are well-known among their customers and neighbors for our ethical and honest mode of operation. Many other companies take advantage of their customers’ lack of experience and provide low-quality services at exorbitant rates. At High 5, we've built our business based on honesty, integrity, quality work, and exceptional service at fair pricing. Because of these values, it has allowed us to employ the best of the best in our professional fields. Contact us today and schedule an in-home cost estimate for your plumbing, HVAC or electrical in the Denver area. We proudly offer a Senior Discount and Military Discount of 10% off up to $100.
"Over 7 weeks AND 13 visits, we were intermittently subjected to gas leaks, water leaks, no hot water or heat and error codes on our tankless water heater. They took advantage of the fact that my 2 teenagers and I had no hot water and no heat and continuously up-charged us. During that time, they charged an extra $1900 over the original estimate of $4000. All of the issues were because they failed to recognize that my existing venting didn’t match the new unit (even though they added to the venting) and because they didn’t provide drain piping to manufacture recommendations. They offered me money back and then rescinded the offer as the problems they should have caught just continued. I ended up “chatting” with the manufacturer and showing them screenshots to prove the venting was wrong. They offered a cleaning crew after I complained and already cleaned up the mess they ground into the carpet. When I asked to speak to the owner/DORA license holder, Levi Torres, I was told Levi “doesn’t take phone calls”. Clearly, he only takes your money and wastes your time."
Elizabeth B on April 2025
If you have any plumbing, heating, cooling or electrical issues at all, contact the experts at High 5 today. We are highly experienced and extensively trained. Using state-of-the-art equipment and a comprehensive understanding of plumbing and HVAC, we handle all of your needs in a timely and professional manner. Whether you need to install, repair, or replace piping, unclog a toilet, replace your ceiling fan, repair an electrical box, install a new air conditioner, need furnace maintenance, or more, they can handle it quickly and efficiently. With High 5, you can count on their expert plumbers, electricians, and HVAC technicians to show up as at your home on time and ready to work. We are well-known among their customers and neighbors for our ethical and honest mode of operation. Many other companies take advantage of their customers’ lack of experience and provide low-quality services at exorbitant rates. At High 5, we've built our business based on honesty, integrity, quality work, and exceptional service at fair pricing. Because of these values, it has allowed us to employ the best of the best in our professional fields. Contact us today and schedule an in-home cost estimate for your plumbing, HVAC or electrical in the Denver area. We proudly offer a Senior Discount and Military Discount of 10% off up to $100.
"Over 7 weeks AND 13 visits, we were intermittently subjected to gas leaks, water leaks, no hot water or heat and error codes on our tankless water heater. They took advantage of the fact that my 2 teenagers and I had no hot water and no heat and continuously up-charged us. During that time, they charged an extra $1900 over the original estimate of $4000. All of the issues were because they failed to recognize that my existing venting didn’t match the new unit (even though they added to the venting) and because they didn’t provide drain piping to manufacture recommendations. They offered me money back and then rescinded the offer as the problems they should have caught just continued. I ended up “chatting” with the manufacturer and showing them screenshots to prove the venting was wrong. They offered a cleaning crew after I complained and already cleaned up the mess they ground into the carpet. When I asked to speak to the owner/DORA license holder, Levi Torres, I was told Levi “doesn’t take phone calls”. Clearly, he only takes your money and wastes your time."
Elizabeth B on April 2025
Family owned & operated for over 35 yrs. Honest & reliable heating and A/C which includes repair and service of all brand furnaces, boilers and A/C. New installation of furnaces, boilers & A/C. Humidifiers, water heaters, air cleaners and misc. plumbing issues. Install new gas lines for adding stoves, driers etc.; New construction
"Viking had serviced my furnaces and air conditioners in the past. Price was a little high but work was satisfactory. This year, I called four times and used their web site over a six week period to try to schedule a service appointment for the air conditioners. Although I was always told their scheduler would get back to me they never did. A big waste of my time and past money trying to establish a service relationship I could count on. I gave them a "D": rather than an "F" as their call service at least answered all though that was it."
Bruce M on July 2020
Family owned & operated for over 35 yrs. Honest & reliable heating and A/C which includes repair and service of all brand furnaces, boilers and A/C. New installation of furnaces, boilers & A/C. Humidifiers, water heaters, air cleaners and misc. plumbing issues. Install new gas lines for adding stoves, driers etc.; New construction
"Viking had serviced my furnaces and air conditioners in the past. Price was a little high but work was satisfactory. This year, I called four times and used their web site over a six week period to try to schedule a service appointment for the air conditioners. Although I was always told their scheduler would get back to me they never did. A big waste of my time and past money trying to establish a service relationship I could count on. I gave them a "D": rather than an "F" as their call service at least answered all though that was it."
Bruce M on July 2020
Window a/c unit installations FAQs
Running a window air conditioner to cool a small room often costs less than $4 per day, making it cheaper than central air for single-room cooling. However, central air might be more efficient if you're using multiple window units or need to cool a space larger than 1,000 square feet. Choosing the right size AC is crucial—a unit that's too big or small can waste energy and increase costs.
Window AC units can use a significant amount of energy. These units use about 12 to 17 kilowatt-hours per day, significantly more than a refrigerator's one to 1.5 kilowatt-hours per day. To keep your energy costs down, run your window AC only when necessary, keep doors closed to contain the cool air, regularly clean filters and coils, and seal any gaps around the unit to prevent cold air from escaping.
Inexpensive air conditioner units are often not worth it. Low-cost products from popular brands like General Electric, LG, Whirlpool, or Frigidaire may be a reasonable investment. However, putting a small, budget-friendly unit in a large room wastes energy and shortens the life span of the AC since it has to draw more power and work much harder to cool the space. The unit will consume more energy and stress the motor and other internal parts, resulting in early breakdown and costly repairs.
The best deals on window AC units come during the fall when businesses slash prices to clear out old inventory. You can also speak with your local AC installer, who may get you a good deal on a window AC unit since they have access to trade pricing. You can also watch for discontinued products and flash sales in your area.
Window AC repair costs between $110 and $390, with most people paying around $250. Parts cost between $2 and $150, with the rest going toward labor, at around $30 per hour. The occasional one-off repair or a routine AC tuneup cost $75 to $200. Servicing can keep your AC running in good condition for several more years before you need to pay for a replacement unit.
Window AC units last eight to 10 years when installed and maintained correctly. High-quality models last up to 20 years with proper care and routine maintenance. The unit’s longevity depends on its construction quality, regular cleaning, and electrical safety inspections. Keeping the filters and coils clean and addressing minor repairs promptly extends its effective performance and ensures reliable cooling.
- Birmingham
- Phoenix
- Tucson
- Fresno
- Long Beach
- Los Angeles
- Modesto
- Sacramento
- San Diego
- San Francisco
- San Jose
- Denver
- Hartford
- Washington DC
- Fort Lauderdale
- Jacksonville
- Miami
- Orlando
- Tampa
- Atlanta
- Chicago
- Indianapolis
- Louisville
- New Orleans
- Baltimore
- Boston
- Detroit
- Grand Rapids
- Minneapolis
- Saint Paul
- Kansas City
- Saint Louis
- Las Vegas
- Albany
- New York
- Asheville
- Charlotte
- Greensboro
- Raleigh
- Winston Salem
- Cincinnati
- Cleveland
- Columbus
- Oklahoma City
- Portland
- Harrisburg
- Philadelphia
- Pittsburgh
- Providence
- Memphis
- Nashville
- Austin
- Dallas
- El Paso
- Fort Worth
- Houston
- San Antonio
- Salt Lake City
- Norfolk
- Richmond
- Virginia Beach
- Seattle
- Madison
- Milwaukee
Get our Angi-powered app
