Building efficiency replaced our two 25 year old gas furnaces with heat pumps in late 2022/early 2023, and did a terrific job. The new system is quieter, safer, and more efficient, plus we now have air conditioning, which is becoming more and more necessary on the Peninsula. Dave Hamburger was able to advise us about all different kinds of equipment, and he chose the system that would be best for our house. Sometimes contractors just do the same thing over and over again, but not these guys. The install team was also terrific and accommodating. I highly recommend them!