The whole team at SumZero Energy is knowledgeable, professional, and they do excellent work. We converted our 1800’s-built home from an oil heat system to an efficient ductless mini-split setup over the course of two years. Initially receiving several quotes, SumZero was our top choice because the solution David had for our unique space was creative, addressed our needs, fit and respected the intricacies of our home best, and was more affordable than the competition. It was also scalable to allow us to grow the solution over time. The work was done on time and the craftsmanship of the installation was fabulous. Questions and concerns were always met respectfully and with great attention to detail. The whole team is respectful, knowledgeable, and will work with you to find the right solution. After the heat pump installation, they came to our rescue with our water heater, and we also worked with them for insulation while that was still a service they offered. We are so happy with the work and highly recommend this great team. I will look for more opportunities to work with this company.