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Last Updated: February 25, 2025
If you're like the average American, more than half of your energy bill (55%, per the Department of Energy) goes toward heating and cooling your home. You don't want to spend more than you need to on temperature control in your Duluth home, so it's important to make sure all systems are functioning properly.
Browse our guide to the top HVAC companies in Duluth to find the best choice for you and your home. Our topic contractors can help you stay comfortable while reducing your bills.

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

Our Rating
User Rating
Informative resources
Clear pricing policy
Services Offered

Our Rating
User Rating
Clear pricing policy
Free quote
Services Offered

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

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

Our Rating
User Rating
Informative resources
Services Offered

Our Rating
User Rating
Clear pricing policy
Free quotes
Prompt service delivery
Services Offered

Our Rating
User Rating
Informative resources
Reliable customer support
Services Offered

Our Rating
User Rating
Informative resources
Reliable customer support
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 repairs or replacement. Watch for these signs that your system needs service:
If you notice any of the above, it's wise to have a local HVAC technician inspect your system. They can pinpoint problems and recommend whether repair or full HVAC replacement is the better solution.
The cost of HVAC installation or maintenance will differ depending on the kind of unit you have. Common kinds of HVAC units include the following:
The price of HVAC maintenance also depends on what kind of work being done. HVAC systems are complicated and may require different kinds of maintenance. The prices of some common jobs are as follows:
| HVAC Unit Type | Cost | |
|---|---|---|
| Split | $1,839-$4,688 | |
| Hybrid Split | $3,726-$6,864 | |
| Heat Pump | $2,885-$29,397 | |
| Packaged Heating and Air | $241-$402 |
Essential HVAC maintenance is important, but can be pricey. Luckily, there are steps homeowners can take to reduce wear and tear on their system and lower future maintenance needs.
| Service | Cost | |
|---|---|---|
| Filter Replacement | $60-$161 | |
| Condensor Cleaning | $1,207-$3,621 | |
| Thermostat Repair | $80-$201 | |
| Ductwork Cleaning | $386-$966 |
Knowing what to look for in an HVAC company is important for a successful project. Look for an experienced, licensed contractor that can give you peace of mind and ensure your system provides reliable air conditioning and heating for your home.
Contact at least three HVAC providers for quotes. Explain your issues and schedule an in-person inspection if possible. Compare providers' diagnoses, suggested repairs, estimated costs, timeframes, and warranties. Avoid providers that pressure you or demand upfront payment.
Look for an HVAC company that employs qualified technicians with the necessary licensure and training. HVAC contractors in all states must obtain a Section 608 Technician Certification from the Environmental Protection Agency (EPA). This certification is mandatory for any individual who helps "maintain, service, repair or dispose of equipment that could release refrigerants into the atmosphere." Contractors must pass an exam (the type of exam depends on what kind of equipment they intend to work with) to be certified by the EPA. All other licensing requirements are handled at the state level.
There are no state-level licensing requirements for HVAC technicians in Minnesota, although all contractors are required to file a $25,000 mechanical contractor bond with the Department of Labor and Industry. Many areas also have local licensing regulations, so always check with your city or municipal government to make sure your contractor meets all requirements. You should also check reviews and complaints on sites like Google Reviews, Yelp, and the Better Business Bureau (BBB). Choose a company with glowing reviews and testimonials about fantastic customer experiences.
Make sure you understand the details of your project before starting. For HVAC repairs, have your provider list which parts require replacement and why. Get confirmation that your technician will clean and test the system after the repair to ensure that everything works. When replacing your HVAC, ask your installation company to provide details on the new brand, energy efficiency, model, features, and estimated installation time. Before work begins, make sure you understand the process your provider will use to select the correctly sized system for your home and what the cost will be.
Good HVAC companies offer warranties on service and equipment installations. The more complete the coverage, the better. Compare warranty details between providers and pick the one that offers the best protection for a fair price.
Get written quotes before beginning HVAC work. The quote should include costs for both labor and materials. Review all terms carefully before signing.
Generally, you should have your HVAC system inspected twice a year. After that inspection, your HVAC technician will tell you what, if any, services are required. You should also call a technician if you notice any new issues, like unusual smells, strange noises, or leaks. If your home has ductwork, it should be serviced every few years.
The best times to have an HVAC inspection are during the spring and fall. Technicians tend to be 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, which is when it normally gets 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 you can and avoid making 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 roughly one to 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 between half a day and two days. This timeline will be affected by the size of your home, how easily accessible your system is, and any new issues your technician uncovers.
For a 2,000-square-foot home, you'll want a furnace that's between 50,000 and 80,000 BTUs (British thermal units). In Duluth, you'll probably want a furnace on the higher end of (or even above) this range.
For a 2,000-square-foot home, you'll also want an air conditioning unit with around 2.5 to 5 tons of capacity. In Duluth, a unit with a lower capacity may be sufficient. In general, if your home is larger than 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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