This was our 2nd time dealing with NASA Heating & AC Services (They supplied and installed New AC at our previous home). As before, it was a wonderful experience. Mr Amit Gupta was very responsive andafter inspecting our home advised us to go for 60K btu furnace as against the old 80K one which had broken down. He said the earlier furnace was oversized and must have been giving us hot n cold pockets which was right. In fact a couple of our rooms used to be so cold that you required an extra heater. He arrived on the date and time he had promised and the entire installation process was very professionally done by him n his team. The performance of the new furnace has been simply wonderful and we have even heating in our home, plus the two roomsat the farther end that had very low heating are way better, in fact very comfortable. Mr Gupta called at least 5-6 times over the next 3 weeks asking about the performance of the furnace and any concerns. We would strongly recommend NASA and Mr.Gupta to anyone who wants the correct advice, professional work and outstanding after sales service.