
Air Handlers
Air Handlers

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Preferred™ Air Handler 40MUAA
284ANV
COOLING EFFICIENCY: Up to 22 SEER2
HEATING EFFICIENCY: Up to 10.5 HSPF2
COMPRESSOR TYPE: Variable-Speed -
Preferred™ Air Handler Ductless System
288BNV
COOLING EFFICIENCY: Up to 18.5 SEER2
HEATING EFFICIENCY: Up to 9 HSPF2
COMPRESSOR TYPE: Variable-Speed -
Preferred™ Air Handler Ductless System227TBN
COOLING EFFICIENCY: Up to 16 SEER2
HEATING EFFICIENCY: Up to 7.8 HSPF2
COMPRESSOR TYPE: Two-Stage

Built on Trust. Powered by Expertise.
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From emergencies to routine calls, our team is always ready, day or night, to restore your comfort quickly.
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We offer flexible financing and value-packed memberships to keep your home running smoothly all year.
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Your home is in safe hands with fully certified technicians and reliable, code-compliant service.
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Serving Snohomish and King County with trusted, community-focused HVAC and electrical expertise.

Hear From Our Happy Customers
At ONESTOP, your satisfaction is our priority! See for yourself what our customers have to say about working with us.
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Adam and his installers arrived the next morning, on time! The crew did a great job and were done sooner than I'd expected. They not only installed my new Trane furnace, but they also made the whole area look better and cleaner.- Carrie S.
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My new HVAC system works perfectly, and their teamwork was a pleasure to behold, even in hot July weather. The best communication and customer service anyone could hope for. They all really are five stars!
- Joy A. -
I recently hired Onestop for a furnace repair, and I couldn't be happier with the service they provided. From the moment I contacted them to the completion of the repair, Onestop demonstrated professionalism and expertise that exceeded my expectations.- Ashley N.
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I have to say, Onestop is top-notch, and Adam was great to work with, did not give us the run-around of what we didn’t need, as most companies seem to do. Adam was upfront and honest. Fantastic prices, exceptional customer service!- Sarah H.
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They serviced my AC and furnace and were professional, friendly, and clearly knew what they were doing. No pressure, just honest and reliable service. I’m really happy with how everything turned out and will definitely be using them in the future.- Matt H.
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They serviced my furnace and AC, and they were on time and super friendly. I would highly recommend Onestop all my family and friends.- Joshua F.
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Adam was phenomenal. He was not pushy and provided me with all my options. He even explained everything to me in great detail. He really helped me make an educated decision. He educated me on SEER ratings and the different types of furnaces that exist.- Bob C.
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I recently hired Onestop to install a new AC unit in my rental property in Mountlake Terrace, and I couldn't be more pleased with the service I received. From start to finish, the team impressed me with their professionalism, expertise, and attention to de- Danielle B.