Top Heating & Furnace Contractors in Merrimack, NH
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Featured Service Pros
Heritage Home Service
Posted by Cynthia B.on 11/17/2018- Elite Service
- Free Estimates
They showed up within a day, they knew what they were doing. And I would definetly recommend them to my friends.
Service Pros
J.P. HVAC
Posted by Stephen B.on 05/15/2022- Free Estimates
Jake came out quickly and solved my AC issue in a couple hours. Give Jake a try, he won’t disappoint!
Triumph Heating and Cooling
Posted by James P.on 10/18/2021- Elite Service
- Warranties
- Free Estimates
John and Evan provided great service and support with the installation of my mother's AC. Went above and beyond, even changing the batteries in the thermostat to ensure no problems in the future. True professionals with a cheerful attitude!
Gotme Under Pressure ?, LLC
Posted by Joseph A.on 07/01/2016- Best of Winner
- Warranties
- Free Estimates
- Deal
responsive, friendly and trustworthy are just three words that come to mind. His work was prompt and tidy and passed inspection with the town with no issues. I would not hesitate to hire him again
Thimothy Johnson
Posted by cassie L.on 06/26/2013- Elite Service
- Warranties
- Free Estimates
Had a great experience with Thimothy. he was very nice, promt, and broke it down so I could understand what was going on. Will hire him again if I have any other electrical problems.
John Harding
Posted by Ann B.on 03/29/2013- Warranties
- Free Estimates
John installed a new toilet, vanity, and sink. He was professional and hard working. He is also a perfectionist. I would recommend him to everyone with home improvement projects.
Heritage Home Service
Posted by Andy D.on 12/27/2016- Best of Winner
- Elite Service
- Warranties
- Free Estimates
- Deal
The technician explained what he was doing each step of the way. He gave me a few repair options and when I was unsure, he told me what he would do if it was his situation. He called a contractor he worked with to remove and install a piece of wet floorboard so he could finish his repair. I had company coming for Xmas and needed the repair done ASAP, and he was so helpful in getting it completed. Heritage always comes through for me - and Floyd was a pro!!
Harmon Mechanical, LLC
Posted by Michael G.on 03/03/2022- Free Estimates
They showed up on time and completed the installation very quickly.
HOLLIS OIL HEAT SERVICE, LLC
Posted by Allison R.on 11/04/2021- Warranties
- Free Estimates
I had problems with my boiler and no one else was able to solve it and he was able to solve it right away without any issues. He really took his time and was very thorough with the work.
Derry Plumbing & Heating
Posted by Jecinta H.on 05/31/2020- Elite Service
- Free Estimates
- Deal
When our existing water tank started to falter we knew we needed to upgrade. Derry Plumbing and Heating installed a phenomenal tankless system for our 3800+ sq foot home and we never had a reason to complain. Our energy costs went down and we always had hot water for our family of 5 and numerous guests.
JB Mechanical, LLC
Posted by Srivatsan C.on 07/27/2016- Free Estimates
Jeff did an awesome job,., I called him Tuesday afternoon and the work was done perfectly to my satisfaction by Wednesday morning.. Amazing work and reasonable pricing. I would definitely recommend Jeff.
Sam Mechanical Services, LLC
Posted by Justin M.on 06/15/2016- Elite Service
- Warranties
- Free Estimates
instead of a replacement, they suggested a complete repair. they said it was most cost effective option. boiler just needed some TLC. theses guys were honest. they knew what to fix. they cared about my wallet. go to my Yelp review of them. these guys have gained my trust! I finally have a trusted & affordable HVAC company.
Easy A's Plumbing & Heating, LLC
Posted by Nancy H.on 06/19/2019- Warranties
- Free Estimates
I hired them to replace a sluggish toilet. Andrew took my call immediately and set a schedule for the next day. He came right on time and did a great job. I will definitely call them again.
Derek Brown - Licensed Plumber
Posted by David R.on 03/01/2018- Elite Service
- Free Estimates
Derek installed Gas line for a Gas Fireplace at the other end of the house. Placed the new line so that it could be hidden. On time, does what He says and excellent work. He cleans up everything when he is done. Thanks for the Great Job.
Complete Home Services
Posted by James S.on 12/26/2019- Elite Service
- Warranties
- Free Estimates
The owner operator Ian was prompt, professional and did quality work. His prices were very resonable and fair.
- Newly Screened & ApprovedCall For References
Skywalker Services LLC
In Business Since 2000- Warranties
- Free Estimates
We are Tom and Ryan. Two HVAC Guys who do their own thing so we can take the time to provide the quality of work that we can be proud of at the end of the day. From quoting to designing to installing we are there through the whole process and answer questions directly. We would love to check out your next project!
Nicholas Bergeron
Posted by Brady X.on 07/22/2022- Warranties
- Free Estimates
On time, prompt, and was half the price of the other guy who came here. Very knowledgeable contractor.
- Newly Screened & ApprovedCall For References
E Star HVAC
In Business Since 2022- Warranties
- Free Estimates
E Star HVAC LLC 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.
- Newly Screened & ApprovedCall For References
H & M Plumbing & Heating
In Business Since 1983- Free Estimates
Were dedicated to providing our clients with the very best in service, installation, and repair for all phases of your plumbing needs. We specialize in a variety of residential and commercial services and take pride in the attention to detail put into each of the projects we're involved with. We're known for our quality work and the integrity of our business. We look forward to building long-term relationships with our clients, and guarantee your satisfaction.
- Newly Screened & ApprovedCall For References
Excel HVAC, Inc.
In Business Since 1996- Free Estimates
At Excel HVAC, Inc., we pride ourselves on providing quality service that customers can believe in. Whether it is openings, closings or service, we can take care of all of your heating and air conditioning needs. We look forward to working with you!
Maverick Mechanical, LLC
Posted by Nancy D.on 12/26/2022- Elite Service
- Free Estimates
He came when he said he would and fixed my furnace, great job. I would hire him again.
Out of Network Heating & Furnace Contractors in Merrimack, NH
- Northeast Electrical Services L.L.C.
P.O. Box 4006
Portsmouth, NH 03801
- First Class Elite Mechanical
2305 Columbia Circle
Merrimack, NH 03054
- Safeguard Electrical Contractors, LLC
204 County Rd.
Bedford, NH 03110
- R.A. Lemire Heating & A.C.
76 Brown Rd.
Candia, NH 03034
- Standbridge Heating & Air Conditioning, Inc.
17 Airport Road
Nashua, NH 03061
- Temperature By Design, LLC
10 Stanley Ave.
Hudson, NH 03051
- Nadeau Mechanical, LLC
250 Walnut St.
Manchester, NH 03104
- Dantry Plumbing, Heating & AC
579 Bryer Hill Rd., P.O. Box 411
Contoocook, NH 03229
- 21st Century Heating & Air Conditioning, LLC
7 Glendale Drive
Nashua, NH 03064
- J DiPersio Plumbing and Heating
20 Christine Ave.
Tyngsboro, MA 01879
Frequently Asked Questions
What is a furnace?
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What is a furnace?
A furnace generates and distributes heated air throughout your home. A vital part of the heating, ventilation, and air conditioning (HVAC) system—though it does not cool air—you activate a furnace when you set or adjust the temperature in a room using the thermostat. Furnaces can run off natural gas, oil, electric, or propane.
How long does a furnace last?
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How long does a furnace last?
The average gas furnace lasts 15 to 20 years, though some electric furnaces can last 30 years or more.
- Gas furnace: 15–20 years
- Electric furnace: 20–30 years
- Oil furnace: 15–20 years
In addition to furnace type, your unit’s lifespan also depends on its size and the heating system you have—two-stage furnaces are more efficient and less likely to break than single-stage furnaces.
Having a reputable HVAC technician perform annual furnace maintenance and inspections can help ensure you get the most out of your unit. And, as always, change your filters regularly—a dirty filter can block airflow and overwork the motor.
How often should you change your furnace filter?
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How often should you change your furnace filter?
You should change your furnace filter every one to three months to help maintain air quality, keep energy costs in check, and extend your unit’s lifespan. If people in your home have dust or pet dander allergies, you may consider changing your filters more regularly. Looking for an even simpler guideline? If the filter is dirty, replace it.
How much does a new furnace cost?
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How much does a new furnace cost?
The average cost of a furnace unit is $2,300 to $7,200, plus $150 to $500 per hour for installation. Furnace replacement prices depend on the type of furnace you need, its size, and local labor costs.
- Gas: $3,800–$10,000
- Electric: $2,000–$7,000
- Oil: $6,750–$10,000
- Mini-Split: $2,000–$15,000
- Geothermal: $4,000–$17,000
If your furnace installation requires new gas lines or additional ductwork, add $250 to $800 for the gas lines and $3,00 to $5000 on average for the ductwork to your overall project costs.
Top Heating & Furnace Systems Projects
- Install a Geothermal Heating or Cooling System
- Install an Electrical Baseboard or Wall Heater
- Install a Radiant Floor Heating System
- Install or Replace a Thermostat
- Install or Replace Ductless Mini-split Heating System
- Install or Replace Ductwork
- Install or Replace Furnace or Forced Air Heating System
- Repair an Electrical Baseboard or Wall Heater
- Repair or Reprogram a Thermostat
- Repair or Service a Boiler or Radiator Heating System
- Repair or Service a Heat Pump
- Repair or Service Furnace or Forced Air Heating System
- Repair Radiant Panel Heating Units
- Service a Geothermal Heating or Cooling System
HomeAdvisor Community Rating
Merrimack Heating & Furnace Contractors are rated 4.8 out of 5 based on 2,082 reviews of 35 pros.
The HomeAdvisor Community Rating is an overall rating based on verified reviews and feedback from our community of homeowners that have been connected with service professionals. See individual business pages for full, detailed reviews.
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Recent Job Requests for Heating & Furnace Contractors in Merrimack, NH
NewProject: Heat Pump Repair Location: Merrimack, NHDate: 01/25/23Location: Home/ResidenceIs this an emergency?: NoDesired Completion Date: Timing is flexibleRequest Stage: Ready to HireComment: Full cleaning of mini split systems.NewProject: Heat Pump Install Location: Merrimack, NHDate: 01/22/23Install or Replace: Installing newHeating System Type: Electric-fired forced air (central heating)Heat pump type wanted: Want recommendationLocation: Home/ResidenceDesired Completion Date: Timing is flexibleRequest Stage: Planning & BudgetingComment: I have one room that I heat with an electric unit installed in the wall. The rest of the house is gas heat.Project: Oil Furnace - Install Location: Merrimack, NHDate: 01/14/23Kind of Heating System: Oil firedLocation: Home/ResidenceDesired Completion Date: Timing is flexibleRequest Stage: Ready to HireProject: Gas Furnace - Install Location: Merrimack, NHDate: 12/28/22Nature of Project: Replace existing central heating systemAge of Heating Equipment: 16 - 20 yearsKind of Heating System: Propane gas firedLocation: Home/ResidenceDesired Completion Date: Within 1 weekRequest Stage: Planning & BudgetingProperty Owner: YesAre you interested in financing?: NoComment: replace cozy gas fired vented room heater # bc502d