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Last Updated: February 25, 2025
On average, 55% of the energy used in American homes is for heating and cooling, according to the Department of Energy. With so much money spent on cooling and heating your Bay St. Louis home, you want to know that you're getting the best return on your investment.
We've compiled this guide to Bay St. Louis' top HVAC companies to help you choose the right person for your job and get your system into its best shape ever.

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User Rating
Informative resources
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Reliable customer support
Prompt service delivery
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Services Offered

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

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

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

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

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

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

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

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

Our Rating
User Rating
Informative resources
Reliable customer support
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:
If your HVAC system is having issues or getting near the end of its lifespan, it likely needs repairs or replacement from an HVAC company. Watch for these signs your system needs service:
If you notice any of the above, have a local HVAC technician inspect your system. They can diagnose problems and let you know whether repair or full HVAC replacement is required.
The cost of HVAC installation or maintenance will differ depending on the type of unit you have. Common varieties of HVAC units include the following:
The amount you spend on HVAC maintenance also depends on the kind of work you're having done. HVAC systems are complicated and can require different kinds of maintenance. The cost of some common repairs is as follows:
| HVAC Unit Type | Cost | |
|---|---|---|
| Split | $1,703-$4,341 | |
| Hybrid Split | $3,450-$6,356 | |
| Heat Pump | $2,671-$27,221 | |
| Packaged Heating and Air | $224-$373 |
Repairing or replacing your HVAC system when needed is important, but can be costly. Luckily, there are steps you can take to reduce gradual wear and tear on your system.
| Service | Cost | |
|---|---|---|
| Filter Replacement | $56-$149 | |
| Condensor Cleaning | $1,118-$3,353 | |
| Thermostat Repair | $75-$186 | |
| Ductwork Cleaning | $358-$894 |
It's important to know what makes a good HVAC company. A properly licensed contractor with the right experience will give you confidence that they can maintain your HVAC system properly, providing you with effective heating and cooling for your home.
Get quotes from at least three HVAC companies. Explain your issues and ask if technicians can inspect your system in person. Compare each company's diagnoses, recommended solutions, estimated cost, timelines, and warranties. Avoid companies that pressure you or demand payment before work.
When picking an HVAC provider, choose one with technicians that have the appropriate training, licenses, and experience. In all states, HVAC contractors must obtain a Section 608 Technician Certification from the Environmental Protection Agency (EPA). This certification is mandatory for all technicians who "maintain, service, repair or dispose of equipment that could release refrigerants into the atmosphere." An individual must pass an exam (the type of exam depends on the type of equipment they intend to work with) to be certified by the EPA. All other licensing requirements are handled at the state level.
In Mississippi, HVAC contractors and subcontractors are required to be licensed by the Mississippi State Board of Contractors. To obtain this license, contractors must provide proof of general liability insurance, as well as workers' compensation insurance if they have above a certain number of employees. You should also look at a company's reviews and complaints on sites such as Yelp, the Better Business Bureau (BBB), and Google Reviews. Pick a company with great feedback and good customer testimonials.
It’s important to understand what the work process will look like. For HVAC repairs, the company should list the exact parts that need replacement and why. Confirm that your technician will clean and test your system afterward to make sure everything is operating properly. When replacing your HVAC system, ask the contractor to describe the new features, estimated installation time, brand, model, and energy efficiency. Before signing a contract, ask how your provider plans to accurately size the unit for your home and how much it will cost.
Reliable HVAC companies offer warranties on service and installations. The more complete the coverage, the better. Review warranty details between companies and pick the one that provides the most comprehensive protection within your budget.
Always get HVAC quotes in writing before work begins. A thorough quote covers costs for both labor and materials. Confirm that you understand all terms before signing the contract.
You should have your HVAC system inspected twice a year. After completing their inspection, your technician will tell you what services are needed. You should also have your system inspected if you start noticing issues such as strange noises, leaks, or unusual smells. If your home has ductwork, it should be inspected every few years.
Generally, you should schedule inspections in the spring and fall, as technicians tend to be less busy at these times. This also helps make sure your system is prepared for the summer and winter, when it typically sees the most use.
You can save energy during the summer by reducing the amount of power your HVAC system uses to keep your home cool. Set your thermostat as close to the outside temperature as you comfortably can, and avoid making drastic changes in temperature all at once. Keep your roof well-maintained and seal any door or window leaks to help keep cool air in. Similarly, make sure your attic is well ventilated to avoid trapping excess heat in your home.
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 might take between half a day and two days. This timeline can be determined by the size of your house, how easily accessible your system is, and any new issues your technician discovers.
For a 2,000-square-foot home, you should look for around 2.5 to 5 tons of air conditioning capacity. In Bay St. Louis, you'll probably want to explore units on the higher end of this range. For a house over 1,000 square feet, central air will generally be more effective for cooling than window units.
For a 2,000-square-foot home, you'll also look for a furnace that is between 50,000 and 80,000 BTUs (British thermal units). In Bay St. Louis, you might be able to make do with a lower-capacity furnace.
Your HVAC company may offer financing options via a third-party lender, or you may choose to obtain your own loan. It's a good idea to discuss payment options with a financial advisor and your HVAC company to make sure that you find the best option for you.
There are a number of ways you can make your HVAC system more energy-efficient:
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