A-1 Guaranteed is a family-owned and operated business that serves Solano, Napa, and Contra Costa Counties with Heating and Air Conditioning, Solar, Tankless Water Heaters, Windows, Insulation and/ or Duct Replacement needs. As one of the premier service businesses in the area, we have helped thousands of satisfied, loyal customers improve the energy efficiency of their homes and offices.
We are available Monday through Friday and by appointment on Saturday. Our fast and efficient attention to your needs will prove our dedication to our customers is the foundation of our business. Our professional staff is knowledgeable and looks after your best interests when it comes to your environmental comfort needs. A-1 Guaranteed has earned many awards and certifications including Kron4's Best of the Bay for multiple years, Solano County's Best of Solano for 10 years, Diamond Certified, Better Business Bureau Honor Roll and are Bay Area Green Business. We are also an Energy Upgrade Ca participating contractor. We are honored that our customers consider us #1 in providing trustworthy service and dependable comfort.