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509-237-6483

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Heating & Cooling Installation

Your Trusted HVAC Specialists

  • Schedule 24/7 - we're here when you need it most!
  • Certified Technicians - licensed & insured!
  • Quick Repairs - done right!
  • Quality Service - you'll love!

For 25 Years Mainstream has been providing top-rated HVAC installation, repair & maintenance for total home comfort. Trust our HVAC experts—call for your hassle-free consultation today!

HVAC technician installs new high-efficiency furnace

SPECIAL OFFERS

Mainstream Savings & Offers

A/C Tune-up $79

Expires:  05/31/2026

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$50 Off Any Service

Expires:  12/31/2026

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5-Star Service

Real Reviews

Harrison W.

I recently had Mainstream inspect my furnace and A/C and their service was nothing short of exceptional. Zach was not only punctual but also incredibly thorough in their inspection process. He took his time to ensure everything was checked and double-checked, leaving no stone unturned. 

Netha M.

Ryan was personable, professional, and extremely knowledgeable of our intricate A/C system. We make it a point to use Mainstream for all of our heating, cooling, and electrical needs. Top notch company that truly stands behind its work.

Shannon B.

They are courteous, responsive and very knowledgeable. The Technician repaired our furnace quickly! We are so grateful and will be using their service in the future!

Brandon E.

Joe was phenomenal. He not only did a thorough inspection of our furnace, he took the time to explain what he was seeing so that I could feel more confident in the overall status of my HVAC system. I will absolutely be sticking with Mainstream .

Laurie R.

Parts for the furnace were way back ordered but Kenny was able to do something to keep our furnace running during all this time. I would recommend Mainstream above and beyond ANY other heating and air conditioning service!

Sheree G.

Mainstream is prompt, professional and courteous. I had my entire HVAC system installed by Mainstream and it’s outstanding.

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509-237-6483

Mainstream Isn't Just HVAC Installation

Mainstream HVAC Technician Bringing In an HVAC Unit

Emergency HVAC

Instant peace of mind with our emergency HVAC services—because comfort can’t wait.

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Mainstream Technicians Looking at Truck Interior

AC Maintenance

Extend the life of your system and improve efficiency with our comprehensive maintenance services.

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Technician About to Work on Plumbing

Plumbing

Like most people, you might not think much about your plumbing – until something happens.

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Mainstream Technicians Working on Pipe in Home's Basement

Drains & Sewers

Your drains are nearly invisible, but far from invincible. We’re here to help keep things flowing.

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Technician Working on Outlet Wiring

Electrical

Our electricians will help get the lights turned on in thousands of Spokane area homes.

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Expert HVAC Installation

Frequently Asked Questions

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Most air conditioner installations can be completed in one day, though complex projects or system upgrades may take longer.
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An air conditioner that is too small for your home may struggle to keep up during hot weather, run constantly, and leave certain rooms feeling warmer than others. Signs of an improperly sized AC system can include uneven temperatures, poor airflow, hot spots, and reduced comfort throughout the house.
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Ductless mini split systems are an efficient way to heat and cool homes without requiring traditional ductwork. Many homeowners use mini splits to improve comfort in rooms that stay too hot or too cold, while also gaining more control over temperatures in different areas of the home.
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