I recommend Boston Standard as a general plumbing and HVAC provider. Their work is high quality and their staff is helpful, professional, and friendly.
We’ve had them service our gas-fired boiler for 4 years since moving in. They are prompt with annual service, attentive to what needs to be done on the system, and realistic about which repair options might not be worth it on an aging machine.
Recently we chose them to install a new air-source heat pump to replace the boiler. This was a large job, and I’m pleased with the work they did. In jobs like this, they sub out some of the work, and the subs were up to the same professional standards as BSC.