My wife used Carl and Son to install a new boiler in her commercial building in Dec 2011. The original installation went reasonably well. She then contracted them to install a new ductless air conditioner in the spring of 2012. It was after that when it became apparent that there would be no after install warranty on these big ticket purchases.
The problem began as soon as we started to use the air conditioner. Water started to drip from the inside unit onto our hardwood floors, causing the floor boards to swell. We called Carl and Son at least three times indicating that water was leaking. Each time we were told that someone would be coming soon, no one ever showed up. We ended up having to hire another contractor to fix the problem, only one month after the original installation. The water leak turned out to be a faulty installation which caused an air lock in the condensation drain pipe. Carl and Son never called back, followed up or showed up.
Recently we placed a service call with regards to the boiler installation. Once again we called Carl and Son hoping to get service on this $8000 installation, calling them less than one year after the original install. We left a message. No one called us back. We didn't expect they would, but we tried none the less. Once again, we had to hire another contractor to fix Carl and Son workmanship.
In our experience, the after installation service is sub-par, and there is no warranty on their workmanship, so we cannot recommend this company for heating or cooling work.