WE’RE OPEN! Because we are considered an essential service, we are open and ready to serve you. Our technicians are closely monitored and practice the highest safety protocols. The health and wellness of our employees and customers remains our top priority.

legacy old logo

(425) 374-7052




  • Energy Efficient Heating Systems.
  • Furnace: Gas & Electric
  • Oil to Gas Conversions
  • Electric Heating Conversions
  • Customized Systems for your home
Air Conditioning

Air Conditioning

  • Heat Pump Installation (Heating and Cooling option)
  • Mini Split Installation (Ductless Heating and Cooling option)
  • Customized Sytems for your home
Repair & Maintenance

Repair & Maintenance

  • Gas Piping and Leak Repair
  • Ductwork Repair
  • Energy Audits
  • Inspection and Repair
  • Annual Maintenance
Ductless Heat Pumps

Ductless Heat Pumps

  • New Installations
  • Service/Repairs
Tankless Water Heaters

Tankless Water Heaters

  • Tankless Water Heater Installation
  • Standard to tankless conversion
  • High Efficienty Indoor/Outdoor Units
  • Customized Systems Available
Ductwork Installation

Ductwork Installation

  • New Ductwork Installation
  • Ductwork Repair
  • Duct Testing


Building performance institute

20+ years

51 certified
North American


about us old


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..



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

Get a free quote: (425) 374-7052

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