Legacy One Heating

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About Legacy One Heating
Legacy One Heating operates as a licensed HVAC contractor serving Mukilteo, Washington and surrounding Puget Sound communities with a 4.7-star average derived from 68 client reviews. The company provides residential and commercial heating, cooling, and indoor air quality services across Seattle, Kirkland, Bellevue, Edmonds, Lynnwood, and Marysville. Their operation runs Monday through Friday, 7 AM to 4 PM, offering scheduled maintenance agreements and emergency repair response for systems experiencing sudden failure.
This contractor distinguishes itself through an extensive brand portfolio representing major manufacturers including Mitsubishi, Daikin, Bosch, and American Standard alongside specialized offerings such as WhisperKOOL cooling solutions and RGF air purification technology. They provide financing options for new equipment installations, enabling homeowners to replace aging furnaces and heat pumps without upfront capital constraints. Their maintenance plans bundle seasonal tune-ups with priority scheduling and discounted repairs, creating ongoing relationships rather than one-time service calls.
Client testimonials consistently identify specific team members providing exceptional service. One reviewer described Casey's thorough diagnostic process when investigating a suspected gas leak, praising the detailed explanations provided during inspection. Another mentioned Colin going beyond standard protocol to ensure proper system setup following installation. A third review credited Karl and office staff Zowe with managing a replacement unit project from estimation through final connection, noting the install team's professionalism throughout.
What Customers Say
Twelve reviewers share detailed accounts of their service experience, with five specifically naming technicians who assisted them. Casey appears in two reviews praising diagnostic thoroughness, while Colin earns recognition for follow-through after installation. The sole four-star reviewer cited communication gaps during initial setup balanced by excellent post-installation support. Positive reviews highlight honesty and pricing transparency; no negative reviews were identified in the sample.
Working Hours
| SundayToday | Closed |
| Monday | 7 AM–4 PM |
| Tuesday | 7 AM–4 PM |
| Wednesday | 7 AM–4 PM |
| Thursday | 7 AM–4 PM |
| Friday | 7 AM–4 PM |
| Saturday | Closed |
Services
Air Conditioning (Repair, Maintenance, Installation, Emergency)
Full-service air conditioning support including seasonal maintenance, diagnostics, repairs, new system installs and emergency outage response to restore cooling quickly.
Heating Systems (Furnace, Heat Pump, Ductless Mini-Splits)
Heating services cover furnace repair and installation, heat pump servicing, and ductless mini-split work with system selection and commissioning tailored to home size and efficiency goals.
Indoor Air Quality & Duct Services
Indoor air quality offerings include air filtration and air balancing along with duct repair to improve comfort, airflow and home air cleanliness.
Commercial HVAC & Specialized Systems
Commercial HVAC support and specialty installations such as WhisperKOOL wine cellar systems, with manufacturer experience across brands like Daikin, Mitsubishi and Bosch.
Maintenance Plans & Financing
Preventive maintenance plans and financing options help spread the cost of system upkeep and major replacements while preserving equipment warranties and efficiency.