Top Heating & Furnace Contractors in Nashua, NH
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Featured Service Pros

In business since 2022
Areas Of Expertise: Duct Cleaning, Gas Furnace Install & Repairs, Electrical HVAC , and 1 more
About us: "With over 7 years of experience, Gemini's Heating & Cooling 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. Call us today! no ib by appt only"
"Great experience!! Jeremy made it really easy for me when i decided to renovate my basement and the price fit my budget range perfectly!! Highly recommend and would hire them again on a heartbeat."
Bryan R. in February 2023
Areas Of Expertise: HVAC
"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."
Allison R. in November 2021
Service Pros

Areas Of Expertise: HVAC
"I got excellent service. They were prompt to respond, showed up 15 minutes early :), knew what they were doing, did what I asked, and explained their work after the fact. I had a new gas valve with safety relief and gas line (from dryer to the pipe) installed. I’m extremely happy with their work and professionalism."
Libby M. in December 2022
"Very reliable. Quick service"
Sandy S. in December 2022

Areas Of Expertise: Heating & Cooling Services, Electric, Plumbing , and 1 more
"Thomas was fantastic - he was generous in the time he spent explaining what was the issue, how to fix it, and additional options. Although it was a big job, he was fast, professional, and the fix was immediately evident before he even left!"
Brian K. in January 2018
Areas Of Expertise: Master Electrician
"This was the job I needed done exactly the way I needed at a very reasonable price. Other's told me "what they would do, or what I should do and gave me bloated quotes. Peter came through, timely and efficient, really got me out of a jam."
Edmund C. in December 2022
Areas Of Expertise: HVAC
"Jake came out quickly and solved my AC issue in a couple hours. Give Jake a try, he won’t disappoint!"
Stephen B. in May 2022
In business since 2010
Areas Of Expertise: HVAC
About us: "With over 10 years of experience in the heating and air conditioning industry, we are the experts you need to take care of your home or business. We will treat every house like it's our own. We focus on being detail oriented to make sure all of our customer's are happy. We can handle any of your heating and air conditioning needs. Give CAPLISAC a call today, we look forward to working with you!"
"Excellent customer service. Very professional ."
Ed R. in December 2022

Areas Of Expertise: Central AC - Repairs, Hydronic's, Heat-Gas/Electric , and 2 more
"He came when he said he would and fixed my furnace, great job. I would hire him again."
Nancy D. in December 2022

Areas Of Expertise: Cooling, Sheet Metal, HVAC , and 2 more
"Andrew set up the heating system in my new build and made himself available for any issues I had once I had moved in. Great work, especially for the price as everything is so expensive with a new build right now!"
brittany S. in June 2022
Areas Of Expertise: Portable Generator Install, Electrical Wiring or Panel Upgrade, Electrical for Home Addition or Remodel - Install , and 2 more
"Very professional Knowledgeable Pleasant Affordable"
Bill J. in March 2020

In business since 1989
Areas Of Expertise: Cooling, Heating, Gas Furnace , and 2 more
About us: "N.E.T.R., Inc. is here to help homeowners install the best heating and cooling systems that fits their needs. Since 1989, we've installed heating and cooling systems in Boston and its surrounding areas, tackling tough problems that our clients face. Our goal is to ensure our clients have energy efficient, quiet, reliable systems so they can live their lives to the fullest both at home and at work. Our dedication to our customers' needs is what drives us each and every day. Our approach to temperature control and comfort has helped us become one of the most respected names in heating, cooling, and refrigeration in New England."

Areas Of Expertise: All Plumbing and Heating needs, Generators, Water filtration , and 2 more
"They did a great job."
John L. in May 2020
Areas Of Expertise: All electrical both residential and commercial., Remodels, Troubleshooting and repair , and 2 more
"Superb installation of 17kw Generac Generator at very reasonable price.Very professional and courteous. I highly recommend this individual."
Fred R. in December 2012

Areas Of Expertise: Kitchens and Bathrooms, General Building Repairs, Small Jobs, Handyman Services, Finish Carpentry - Trim, Moulding, Built-Ins , and 2 more
"good work"
Ronald P. in May 2013
Areas Of Expertise: HVAC
"They showed up on time and completed the installation very quickly."
Michael G. in March 2022
Areas Of Expertise: Authorized service and installs on HTP & Munchkin boilers, Authorized service and installs on Bosch waterheaters
"I have used Heat Kits in the past and remember to call them again when I had a problem with the Propane Gas Heater. Prompt service, on time, honest and fixed the problem immediately before the next day freeze of 1-2 degree. I always refer to all my friends and have a good confident about their work, estimate, and cost."
Thamil D. in March 2019

Areas Of Expertise: HVAC Installs, HVAC Service
"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."
Justin M. in June 2016
Areas Of Expertise: Gas Furnace: Install, Gas Boiler or Radiator Heating System - Install, Oil Furnace: Install , and 2 more
"n/a"
Lee .. in September 2019

Areas Of Expertise: Refrigeration, Plumbing, HVAC
"Totally excellent service. My furnace was not working so I had no hot water. I called after 7 pm and Mike was there first thing in the morning to check it out. He located the problem and took immediate action to resolve it. Called suppliers, located the part for a 57 year old furnace. The following day Jason and Chase came and made the repair. Cost effective price with professional workmanship. Reliable and trustworthy."
Ginny P. in August 2022
Areas Of Expertise: Heating & Furnace Systems, Installs & Repairs, A/C & Cooling Systems
"Very pleased! They were the best price. Very personable and friend, very helpful!"
Joanne B. in July 2016
Areas Of Expertise: Ductless Mini-split A/C - Install or Replace
"They are a phenomenal local business and were the best quote we got! Damon had phenomenal communication skills, was timely, did a wonderful job, and even followed up afterward."
Chris B. in October 2022

Out of Network Heating & Furnace Contractors in Nashua, NH
- Northeast Electrical Services L.L.C.
P.O. Box 4006
Portsmouth, NH 03801
- Nashoba Air, Inc.
109 Tyngsboro Rd.
North Chelmsford, MA 01863
- St. Jean Heating & Cooling
P.O. Box 15
Wilmington, MA 01887
- Temperature By Design, LLC
10 Stanley Ave.
Hudson, NH 03051
- Nadeau Mechanical, LLC
250 Walnut St.
Manchester, NH 03104
- Bill Trombly Plumbing & Heating
76 Maple St.
Manchester, NH 03103
- Loder Mechanical Services
38 Bolton Rd
Billerica, MA 01821
- MARCUM MECHANICAL LLC
P.O. Box 5
Brookline, NH 03033
- Hermy's Heating & AC
P.O. Box 247
Rapid City, SD 57702
- NISSITISSIT HVAC
78 Prescott St
Pepperell, MA 01463
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 Boiler or Radiator 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 Furnace or Forced Air Heating System
- Repair Radiant Panel Heating Units
- Service a Geothermal Heating or Cooling System
HomeAdvisor Community Rating
Nashua Heating & Furnace Contractors are rated 4.9 out of 5 based on 1,460 reviews of 43 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 Nashua, NH
NewProject: Electric Furnace - Install Location: Nashua, NHDate: 02/04/23Kind of Heating System: Electric firedLocation: Home/ResidenceDesired Completion Date: Timing is flexibleRequest Stage: Ready to HireNewProject: Heat Pump Install Location: Nashua, NHDate: 02/04/23Install or Replace: Installing newHeating System Type: Hydronic baseboard heatHeat pump type wanted: Ground source (Geothermal)Location: Home/ResidenceDesired Completion Date: Within 1 weekRequest Stage: Planning & BudgetingComment: I'm just curious, wondering what it would cost to install in my apartment building. There are about 15 units in an old converted mansion. It has a really old oil fed boiler and radiators. Would need all new duct work as none currently exists. Has a very large back yard probably half an acre. And also what would the run cost be?Project: Gas Furnace - Install Location: Nashua, NHDate: 01/27/23Request Stage: Ready to HireDesired Completion Date: Within 1 weekKind of Heating System: Natural gas firedLocation: Home/ResidenceProject: Gas Furnace - Repair Location: Nashua, NHDate: 01/26/23Current Heating System: Natural gas firedLocation: Home/ResidenceIs this an emergency?: NoDesired Completion Date: Within 1 weekRequest Stage: Ready to HireProject: Heat Pump Install Location: Nashua, NHDate: 01/26/23Install or Replace: Installing newHeating System Type: Gas-fired forced air (central heating)Heat pump type wanted: Want recommendationLocation: Home/ResidenceDesired Completion Date: 1 - 2 weeksRequest Stage: Ready to HireComment: Install new heat pumpProject: Gas Furnace - Repair Location: Nashua, NHDate: 01/18/23Current Heating System: Natural gas firedAge of Heating Equipment: More than 20 yearsLocation: Home/ResidenceIs this an emergency?: YesDesired Completion Date: ImmediatelyProblem with Heating System: Gas smellComment: piece of exhaust pipe rusted off and smells like gasProject: Gas Boiler or Radiator Heat Install Location: Nashua, NHDate: 01/18/23Additional thermostats: NoType of system: Natural gas firedLocation: Home/ResidenceDesired Completion Date: 1 - 2 weeksRequest Stage: Planning & BudgetingComment: forced hot water heating system, time for boiler to be replacedProject: Gas Boiler or Radiator Heat Repair Location: Nashua, NHDate: 01/18/23Type of system: Natural gas firedLocation: Home/ResidenceIs this an emergency?: NoAfter Business Hours: NoDesired Completion Date: Timing is flexibleRequest Stage: Ready to HireProject: Gas Furnace - Repair Location: Nashua, NHDate: 01/16/23Current Heating System: Natural gas firedLocation: Home/ResidenceIs this an emergency?: NoDesired Completion Date: Within 1 weekRequest Stage: Ready to HireComment: HVAC system fan does not blow, just hums. Guess: it needs cleaning and lubrication, or replacement.Project: Gas Furnace - Install Location: Nashua, NHDate: 01/16/23Desired Completion Date: Timing is flexibleRequest Stage: Planning & BudgetingProject: Gas Furnace - Repair Location: Nashua, NHDate: 01/15/23Current Heating System: Propane gas firedAge of Heating Equipment: 11 - 15 yearsLocation: Home/ResidenceIs this an emergency?: YesDesired Completion Date: ImmediatelyProblem with Heating System: No heat in one locationProject: Gas Furnace - Repair Location: Nashua, NHDate: 01/13/23Desired Completion Date: ImmediatelyCurrent Heating System: Natural gas firedLocation: Home/ResidenceIs this an emergency?: Yes