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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.

Our Rating
User Rating
Informative resources
Prompt service delivery
Clear pricing policy
Reliable customer support
Services Offered

Our Rating
User Rating
Free quotes
Clear pricing policy
Reliable customer support
Services Offered

Our Rating
User Rating
Clear pricing policy
Prompt service delivery
Reliable customer support
Free quotes
Informative resources
Services Offered

Our Rating
User Rating
Prompt service delivery
Clear pricing policy
Reliable customer support
Free quotes
Informative resources
Services Offered

Our Rating
User Rating
Clear pricing policy
Reliable customer support
Free quotes
Informative resources
Services Offered

Our Rating
User Rating
Informative resources
Prompt service delivery
Reliable customer support
Clear pricing policy
Services Offered

Our Rating
User Rating
Reliable customer support
Free quotes
Clear pricing policy
Informative resources
Prompt service delivery
Services Offered

Our Rating
User Rating
Clear pricing policy
Reliable customer support
Prompt service delivery
Informative resources
Free quote
Services Offered

Our Rating
User Rating
Clear pricing policy
Reliable customer support
Prompt service delivery
Services Offered

Our Rating
User Rating
Reliable customer support
Clear pricing policy
Informative resources
Free quotes
Services Offered
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:
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:
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.
Your HVAC installation or maintenance cost fluctuates depending on the type of unit. Common HVAC unit varieties include the following:
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 Type | Cost | |
|---|---|---|
| Split | $2,005-$5,112 | |
| Hybrid Split | $4,063-$7,485 | |
| Heat Pump | $3,146-$32,056 | |
| Packaged Heating and Air | $263-$439 |
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.
| Service | Cost | |
|---|---|---|
| Filter Replacement | $66-$176 | |
| Condensor Cleaning | $1,316-$3,949 | |
| Thermostat Repair | $88-$219 | |
| Ductwork Cleaning | $421-$1,053 |
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.
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.
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.
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.
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 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.
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:
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