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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 U.S. Department of Energy. You don't want to spend more than necessary on temperature control in your Mercer Island home, so it's important to make sure all systems are working properly.
Our guide to the top HVAC companies in Mercer Island can help you save money by getting your HVAC system repaired, installed or replaced for a fair price by a skilled worker.

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

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

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

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

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

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

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

Our Rating
User Rating
Clear pricing policy
Reliable customer support
Prompt service delivery
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An HVAC system that's malfunctioning or outdated likely needs professional attention for maintenance or replacement. Watch for these signs that your system needs service:
Arrange an inspection if you notice any of these problems. A local technician can evaluate your system, detect problems, and figure out whether you need repairs or a new HVAC unit.
HVAC installation or maintenance costs change depending on your system. Common HVAC unit varieties include the following:
The price of HVAC maintenance also depends on what kind of work being done. HVAC systems are complex and can require different kinds of maintenance. The prices of some common jobs are as follows:
| HVAC Unit Type | Cost | |
|---|---|---|
| Split | $2,063-$5,259 | |
| Hybrid Split | $4,180-$7,701 | |
| Heat Pump | $3,236-$32,978 | |
| Packaged Heating and Air | $271-$451 |
HVAC system repairs and replacements are important, but can be expensive. Luckily, homeowners can take steps to reduce wear and tear on their system and lower future maintenance needs.
| Service | Cost | |
|---|---|---|
| Filter Replacement | $68-$181 | |
| Condensor Cleaning | $1,354-$4,062 | |
| Thermostat Repair | $90-$226 | |
| Ductwork Cleaning | $433-$1,083 |
Knowing what to look for in an HVAC company is crucial for a successful project. Partnering with an experienced, licensed contractor can offer you peace of mind and ensure your system provides reliable heating and air conditioning for your home.
Contact at least three HVAC companies for quotes. Describe the issues and have technicians visit to inspect your system if possible. Compare the providers' explanations, solutions, estimated costs, warranties, and timeframes. Avoid providers that pressure you or demand payment upfront.
It's important to choose an HVAC company that employs technicians with the appropriate qualifications and expertise. HVAC contractors in all states have federal requirements set by the Environmental Protection Agency (EPA). To obtain the EPA Section 608 Technician Certification, individuals must pass an exam (the type of exam depends on what 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 at the state level.
HVAC contractors are required to be licensed as specialty contractors in the state of Washington. Individuals must hold a speciality HVAC license and may also require electrical or plumbing licensure depending on the nature of the job. Licensing is handled by the State Department of Labor and Industries, which mandates that contractors must be both bonded and insured. Checking reviews on Google Reviews, Yelp, the Better Business Bureau (BBB), and similar sites can assist your decision as well. Choose a company with stellar reviews and reports of positive experiences from customers.
Always make sure you know the details of your project. For HVAC repairs, your provider should specify which parts require replacement and why. Confirm that your technician will clean and test the full system after repairs are completed to verify that it’s working properly. When replacing your HVAC system, ask your installation company to provide details on the new energy efficiency, estimated installation time, brand, features, and model. 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.
A reputable HVAC company will back its repair services and installations with a warranty. The longer and more comprehensive the warranty coverage, the better. Carefully compare the fine print between contractors and choose the company that provides the greatest protection at a reasonable price.
Get a written quote before HVAC work begins. A full quote includes both labor and material costs. Make sure you understand and accept all terms before signing the contract.
You should have your HVAC system inspected twice yearly. After the inspection, your technician will tell you if any services are needed. You should also have your system inspected if you notice new issues such as unusual smells, leaks, or strange noises. If your home has ductwork, it should be inspected every few years.
Normally, it's smart to have your HVAC system inspected 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 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 — increase or decrease it a few degrees at a time. If you can, try switching to a smart thermostat.
It takes between one and three days to have an HVAC system installed or replaced. If you need just a furnace or a single air conditioning unit, this might take between half a day and two days. This timeline can be influenced by the size of your home, the accessibility of your system, and any new issues your technician uncovers.
For a 2,000-square-foot home, you should look for around 2.5 to 5 tons of air conditioning capacity. In Mercer Island, you can probably make do with a unit on the lower end of this range. For homes over 1,000 square feet, central air will usually be more effective than window units for cooling.
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).
Your HVAC company may offer financing options via a third-party lender, or you might be able to obtain your own loan. It's smart to discuss payment options with your HVAC company and a financial advisor to make sure that you find the best option for you.
There are several ways you can make your HVAC system more energy-efficient:
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