10 Best HVAC Companies in Nashua, NH

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Last Updated: February 25, 2025

According to the Department of Energy, about 55% of the energy used in American homes is used for heating and cooling. With so much money invested in heating and cooling your Nashua home, you want to know that you're getting the best return on your investment.

Explore our list of the top HVAC companies in Nashua to find the best one for you and your home. Our topic contractors can help you reduce your bills while still staying comfortable.

Top 10 Best HVAC Companies in Nashua

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Ethical Home Pro

Ethical Home Pro Logo

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User Rating

7 Bellemore Dr Unit 1, Bedford, NH 03110 (603) 216-2593 ethicalhomepro.com

Informative resources

Prompt service delivery

Clear pricing policy

Reliable customer support

Services Offered

Boiler installation
Ac installation
Filtration
Indoor air quality
Furnace repair
Radiant heating
Ductless
Maintenance
Ventilation
Emergency services
Furnace installation
Zoning systems
Ac repair

Frank's Heating & Air Conditioning

Frank's Heating & Air Conditioning Logo

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User Rating

555 Woburn St, Tewksbury, MA 01876 (978) 851-4403 franksheating.com

Free quotes

Clear pricing policy

Reliable customer support

Services Offered

Indoor air quality
Ac installation
Radiant heating
Maintenance
Ductless
Duct cleaning
Inspection
Filtration
Boiler installation
Ventilation
Ac repair
Furnace installation
Zoning systems
Boiler repair
Emergency services

Muirfield Mechanical Services LLC Heating & Air Conditioning

Muirfield Mechanical Services LLC Heating & Air Conditioning Logo

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User Rating

60 Willow Rd, Ayer, MA 01432 (978) 263-7130 muirfieldmechanical.com

Clear pricing policy

Prompt service delivery

Reliable customer support

Free quotes

Informative resources

Services Offered

Ac installation
Furnace installation
Emergency services
Zoning systems
Boiler installation
Indoor air quality
Boiler repair
Smart home integration
Furnace repair
Maintenance
Filtration
Ductless
Inspection

Nicholson Plumbing, Electrical, Heating, and Air Conditioning

Nicholson Plumbing, Electrical, Heating, and Air Conditioning Logo

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User Rating

71 Whitney St, Holliston, MA 01746 (508) 301-1767 nicholson-hvac.com

Prompt service delivery

Clear pricing policy

Reliable customer support

Free quotes

Informative resources

Services Offered

Maintenance
Boiler installation
Furnace installation
Indoor air quality
Ac installation
Ac repair
Inspection
Ductless
Furnace repair
Boiler repair
Emergency services

Nashoba Air & BoilerWorks

Nashoba Air & BoilerWorks Logo

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User Rating

527 Great Rd, Littleton, MA 01460 (978) 540-8676 nashobaair.com

Clear pricing policy

Reliable customer support

Free quotes

Informative resources

Services Offered

Indoor air quality
Maintenance
Furnace installation
Inspection
Filtration
Ac installation
Boiler repair
Ductless
Boiler installation
Emergency services
Furnace repair

Cooling Unlimited, Inc.

Cooling Unlimited, Inc. Logo

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User Rating

565 Main St, Reading, MA 01867 (781) 944-1030 coolingunlimited.com

Informative resources

Prompt service delivery

Reliable customer support

Clear pricing policy

Services Offered

Ductless
Indoor air quality
Emergency services
Ventilation
Boiler installation
Ac repair
Radiant heating
Filtration
Furnace installation
Maintenance
Ac installation

Sanford Temperature Control

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User Rating

96 Old Wilton Rd #1, Milford, NH 03055 (603) 769-3956 choosesanford.com

Reliable customer support

Free quotes

Clear pricing policy

Informative resources

Prompt service delivery

Services Offered

Boiler installation
Indoor air quality
Filtration
Maintenance
Furnace installation
Ac installation
Emergency services
Ductless
Duct cleaning
Ac repair

Townsend Energy

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User Rating

27 Cherry St, Danvers, MA 01923 (800) 888-2888 townsendtotalenergy.com

Clear pricing policy

Reliable customer support

Prompt service delivery

Informative resources

Free quote

Services Offered

Boiler repair
Ductless
Ac installation
Boiler installation
Furnace installation
Furnace repair
Ventilation
Indoor air quality
Ac repair
Maintenance

Addario's Services

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User Rating

2 Gill St Suite J, Woburn, MA 01801 (781) 417-5699 addarios.com

Clear pricing policy

Reliable customer support

Prompt service delivery

Services Offered

Boiler repair
Furnace repair
Boiler installation
Furnace installation
Inspection
Emergency services
Indoor air quality
Ductless
Filtration
Duct cleaning
Maintenance
Ac installation

Climate Design Systems, LLC

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Our Rating

User Rating

15 Aegean Dr STE 3, Methuen, MA 01844 (978) 689-8312 climatedesignsystems.com

Reliable customer support

Clear pricing policy

Informative resources

Free quotes

Services Offered

Filtration
Ac installation
Ac repair
Inspection
Boiler installation
Furnace installation
Furnace repair
Maintenance
Indoor air quality
Emergency services
Today's Homeowner Ranking Methodology

Today's Homeowner looks at dozens of datapoints on hvac companies to come up with our data-driven rankings. It's not possible for a company to pay for preferential treatment in our rankings. We look at the following key factors in determining who should top our list:

  • Company Experience
  • Real User Reviews
  • Company Reputation
  • Accreditations and Licenses
  • Service Area
  • Customer Service
Have questions about our methodology or company ratings? Reach out to FindAPro@TodaysHomeowner.com.

Signs You May Need HVAC Repair or Replacement

An HVAC system that's broken or old likely needs professional attention for maintenance or replacement. Watch for these signals that your system needs service:

  • Refrigerant leaks
  • Rust, corrosion, or cracking
  • Frequent breakdowns and need for repairs
  • Higher than normal energy bills
  • Poor air circulation or uneven heating/cooling
  • Strange noises when the system turns on
  • Thermostat malfunctions or temperature control issues
  • An HVAC system that's over 15 years old

If you see any of these HVAC issues, we recommend having a technician inspect your system. A local professional can identify problems and determine whether repairing or getting a new HVAC unit is the correct solution.

Cost of HVAC Installation and Maintenance in Nashua

Your HVAC installation or maintenance cost fluctuates depending on the type of unit. Common HVAC unit varieties include the following:

  • Split or mini-split: If your home's ductwork can't accommodate a central HVAC system, you likely have a split or mini-split system. Split systems have internal units in each room to control temperature; these indoor units all connect to an outdoor unit.
  • Hybrid split: A hybrid split HVAC system functions much like a standard split system, but has the capacity to draw on either electricity or gas for power.
  • Heat pump: Heat pumps work by circulating warm and cool air between your home and the outdoors. These systems don't create heat or air conditioning themselves, and are more suited to more moderate climates.
  • Packaged heating and air: Packaged HVAC systems are a great choice for smaller homes. They have a single cooling and heating unit, normally in a basement or attic. This unit is often space-saving, energy-efficient, and easy to maintain.

HVAC maintenance costs differ based on the specific services required. HVAC systems can be complicated and potentially require a number of services. Fees for typical jobs are as follows:

HVAC Unit TypeCost
Split$2,005-$5,112
Hybrid Split$4,063-$7,485
Heat Pump$3,146-$32,056
Packaged Heating and Air$263-$439

Ways to Save Money on HVAC Costs

It's important to fix or swap out your HVAC components when they become damaged, but it can also be expensive. Fortunately, there are some steps you can take to slow the wear and tear on your HVAC.

  • Change the position of your blinds seasonally. Keeping your blinds open in the winter helps you take advantage of passive solar heating. Keeping them closed in the summer helps keep some of this heat out. Both of these measures help reduce the amount of work your HVAC system needs to do.
  • Keep your system clean. Cleaning your condenser fan blades, grills, ductwork, and indoor evaporator coil regularly helps your HVAC system work efficiently and lowers the risk of mold growth. The National Air Duct Cleaners Association recommends cleaning your HVAC system once it begins to look dirty.
  • Change filters regularly. Switching out or cleaning your air filters every 30–90 days helps air flow efficiently through your HVAC system. We also recommend regularly clearing dirt and debris away from the outdoor sections of your system.
  • Monitor for potential problems. Monitoring your system for problems — for example, by checking your thermostat and energy bills regularly — helps you catch issues before they get too expensive.
ServiceCost
Filter Replacement$66-$176
Condensor Cleaning$1,316-$3,949
Thermostat Repair$88-$219
Ductwork Cleaning$421-$1,053

How To Choose a Local HVAC Company

Knowing the indicators of a good HVAC company is important. Working with a contractor that's properly licensed and highly experienced will give you confidence that they can fix your system, providing you with effective heating and cooling for your home.

Compare Multiple Bids

Get quotes from three or more HVAC contractors. Explain your issues and ask if specialists can inspect your system in person. Review each company's diagnoses, recommended solutions, estimated cost, timeline, and warranties. Avoid companies that pressure you or demand payment before work.

Check Credentials

Choose an HVAC company with highly trained technicians who have appropriate licensing and experience. HVAC contractors in all states have federal requirements from the Environmental Protection Agency (EPA). To obtain the EPA Section 608 Technician Certification, an individual must pass an exam (the specific exam depends on the kind of equipment they intend to work with). Section 608 certification is required for all technicians who "maintain, service, repair or dispose of equipment that could release refrigerants into the atmosphere." All other licensing requirements are handled on a state-by-state basis.

New Hampshire doesn't have specific state-level licensing requirements for HVAC contractors. However, some contractors may require a Fuel Gas Fitting or Oil Heating Technician license from the Mechanical Safety and Licensing Board. You will also want to verify whether your city or municipality has any local licensing requirements. You should also look at reviews and complaints on sites like the Better Business Bureau (BBB), Google Reviews, and Yelp. Choose a company with glowing reviews and reports of great customer experiences.

Understand Work Details

It’s important to understand what the work process is going to look like. For HVAC repairs, the company should detail the exact parts that need replacement and why. Get confirmation that your technician will clean and test your system afterward to make sure everything is operating properly. When replacing your HVAC, request that the installation company describe the new energy efficiency, model, features, estimated installation time, and brand. Before signing a contract, ask how your provider plans to accurately size the unit for your home and how much it will cost.

Compare Warranties

Trustworthy HVAC companies back their work with warranties. Compare warranties from different companies, while remembering that more comprehensive coverage is better. Look for the provider that offers the most coverage for a reasonable price.

Get Quote in Writing

Get a written proposal before HVAC work begins. A comprehensive quote includes both materials and labor costs. Make sure you understand and accept all terms before signing the contract.

Frequently Asked Questions About HVAC in Nashua, NH

Generally, you should have your HVAC system inspected twice a year. After that inspection, your HVAC technician will tell you what services are required. You should also call a technician if you notice any new issues, like leaks, unusual smells, or strange noises. If you have ductwork in your home, it should be serviced every few years.

The best times to have an HVAC inspection are the spring and fall. Technicians are less busy during these times, so it will be easier to get an appointment. This also helps get your system ready for the summer and winter, when it typically sees the most use.

You can save energy during the winter by reducing how much power your HVAC system uses to heat your home. Keep your thermostat as low as is comfortable and don't make drastic changes in the temperature — only increase or decrease it a few degrees at a time. If you're able to, try switching to a smart thermostat.

It takes between one and three days to have your HVAC system installed or replaced. If you only need a furnace or a single air conditioning unit, this can take anywhere from a few hours up to two days. This timeline can be influenced by the size of your house, how easily accessible your system is, and any issues your technician runs into.

For a 2,000-square-foot home, you'll want a furnace that's between 50,000 and 80,000 BTUs (British thermal units).

For a 2,000-square-foot home, you'll also want to purchase an air conditioning unit with around 2.5 to 5 tons of capacity. In Nashua, a unit on the lower end of this range may be sufficient. Typically, if your home is over 1,000 square feet, central air will be more effective than window air conditioning units.

There are a number of ways you can make your HVAC system more energy-efficient:

  • Keep your air ducts clean and clean or change your air filters on a regular basis.
  • Have regular inspections to take care of issues as they come up.
  • Make sure your doors and windows are well-sealed and keep your attic well-ventilated.
  • Install a smart thermostat. If you don't want to or can't buy one, try to keep the temperature indoors as close to the outside temperature as you can.
  • When you need to replace part of your system, explore Energy Star-certified or other environmentally friendly options.

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