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  • Energy Efficient Heating Systems.

  • Furnace: Oil, Gas & Electric

  • Oil to Gas Conversions 

  • Electric Heating Conversions

Ductless Heat Pumps
  • New Installations

  • Service/Repairs

Air Conditioning
  • Heat Pump Installation (Heating and Cooling option)

  • Mini Split Installation (Ductless Heating and Cooling option)

  • Customized Sytems for your home

Tankless Water Heaters
  • Tankless Water Heater Installation

  • Standard to tankless conversion

  • High Efficienty Indoor/Outdoor Units

  • Customized Systems Available

Repair & Maintenance
  • Gas Piping and Leak Repair

  • Ductwork Repair

  • Energy Audits

  • Inspection and Repair

  • Annual Maintenance

Ductwork Installation
  • New Ductwork Installation

  • Ductwork Repair

  • Duct Testing

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20+ years experience

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For any inquiries, questions or commendations, please call: (425) 374-7052 or fill out the following form

Contact Us

(425) 374-7052



Mailing Address:

4463 Russell Rd #103

Mukilteo, WA 98275


To apply for a job with Legacy One Heating please send a cover letter together with your resume to:  LegacyOneHeating@gmail.com

Get a free quote: (425) 374-7052


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Hello, I'm Karl Christensen, Owner of Legacy Heating and A/C.  I opened Legacy One because I wanted to offer quality HVAC services to my cilents at a fair price with no hard upsells or useless accessories being pushed on them.  

I have over 20 years of experience in the industry and have a degree in Environmental Technologies & Susainable Practices from Cascadia College in Bothell, WA.  In addition to this I am a Certified Energy Auditor and Energy Management Specialist. This means I can help you with a customized energy solution that fits your families' needs.  

Satisfied clients and their referrals mean I'm doing my job right.  I look forward to earning your business..

20+ years experience



Karl totally saved us when our water heater died. I called him, told him the situation and left for work. When I got home, it was like nothing ever happened except that we had a new water heater and hot water again. He is very professional and fair in his prices. It's so nice to have someone you can trust when things like this happen. Thank you Karl! 

-Dr. Brian Godines, owner, Eyecon Optometry

  • Energy Efficient Heating Systems.

  • Furnace: Gas & Electric

  • Oil to Gas Conversions 

  • Electric Heating Conversions

  • Customized Systems for your home

© 2019 Legacy One Heating