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Last Updated: February 25, 2025
According to the Department of Energy, approximately 55% of the energy used in American homes is used for heating and cooling. Since cooling and heating represent such a significant chunk of your utility bills, you'll want to make sure the HVAC system in your Charleston home is functioning optimally.
A top HVAC contractor can get your system into its best shape ever, letting you keep your home comfortable while still saving money. That's why we've put together this guide to the top HVAC companies in Charleston.

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

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

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

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

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

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

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

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

Our Rating
User Rating
Free quotes
Informative resources
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:
A malfunctioning or aging HVAC system probably needs attention from a professional who can make repairs or install a new unit. Keep an eye out for these common signs that your HVAC needs service:
These HVAC red flags indicate that you should have your system evaluated. A local technician can complete an inspection, identify problems, and recommend repairing or replacing your HVAC unit.
The price of HVAC installation or maintenance will vary depending on the type of unit you have. Common types of HVAC units include the following:
The cost of HVAC maintenance also depends on what kind of work being done. HVAC systems are complex and might require different kinds of maintenance. The prices of some common jobs are as follows:
| HVAC Unit Type | Cost | |
|---|---|---|
| Split | $1,933-$4,928 | |
| Hybrid Split | $3,917-$7,216 | |
| Heat Pump | $3,033-$30,903 | |
| Packaged Heating and Air | $254-$423 |
Taking care of necessary HVAC repairs and replacements when needed is important, but can be expensive. Luckily, there are steps you can take to slow the wear and tear on your system.
| Service | Cost | |
|---|---|---|
| Filter Replacement | $63-$169 | |
| Condensor Cleaning | $1,269-$3,807 | |
| Thermostat Repair | $85-$211 | |
| Ductwork Cleaning | $406-$1,015 |
Knowing what to look for in an HVAC company is important for a successful project. Look for an experienced, licensed contractor that can offer you peace of mind and make sure your system provides reliable heating and air conditioning for your home.
Contact at least three HVAC companies for quotes. Describe the issues and have specialists visit to inspect your HVAC system if possible. Compare the contractors' explanations, solutions, estimated costs, timeframes, and warranties. Avoid providers that pressure you or demand payment upfront.
Look for an HVAC company that employs qualified technicians with the necessary licensure and training. HVAC contractors in all states need to obtain a Section 608 Technician Certification from the Environmental Protection Agency (EPA). This certification is mandatory for all contractors who "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 by the state.
Illinois doesn't have state-level contractor licensing requirements. However, there may be local regulations. Be sure to check with your municipal government to verify that your contractor meets all of the requirements. You can also verify an Illinois business license on the Secretary of State's website. Also look at a company's reviews and complaints on sites such as Google Reviews, Yelp, and the Better Business Bureau (BBB). Pick a company with glowing feedback and good customer testimonials.
Always make sure you understand what a company’s process looks like. When HVAC repairs are needed, ask your provider to list which parts need replacement and why. Confirm that your technician will clean and test your system after finishing the work to guarantee proper operation. When replacing your HVAC, request that the installation company describe the new model, brand, energy efficiency, features, and estimated installation time. Before signing a contract, ask about the process your provider will use to properly size the new system for your home and how much it will cost.
Good HVAC companies offer warranties on service and installations. The more complete the coverage, the better. Compare warranty details between companies and pick the one that provides the best protection for a fair price.
Get a written quote before HVAC work starts. A full quote includes both labor and material costs. Make sure you understand and accept all terms before signing the contract.
Normally, your HVAC system should be inspected twice a year. After an inspection, your HVAC technician will tell you what, if any, services are required. You should also have your system inspected and serviced if you start to notice any issues, such as strange noises, unusual smells, or leaks. If you have ductwork in your home, it should be serviced every few years.
The best times of the year to have an HVAC inspection are during the spring and fall. Technicians are often less busy during these times, so it will be easier to get an appointment. This also ensures that your system is ready for the summer and winter, the times of the year when it gets the most use.
You can save energy throughout the year by reducing the amount of power your HVAC system uses to maintain your home's temperature. During all seasons, keep your thermostat as close to the outside temperature as possible, and avoid making drastic changes — adjust it only a few degrees at once. You could also consider getting a smart thermostat.
It takes around one to three days to have an HVAC system installed or replaced. If you need just an air conditioning unit or a furnace, this might 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 uncovers.
For a 2,000-square-foot home, you should look for 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. Typically, if your home is over 1,000 square feet, central air will be more effective than window air conditioning units.
Your HVAC company might offer financing options via a third-party lender, or you may choose to obtain a loan on your own. It's a good idea to discuss payment options with a financial advisor and your HVAC company to make sure that you're choosing the best option for you.
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