help in how to choose a HVAC system
We are buying a new home in the SF Bay area and the gas furnace is very old and it has no AC. We would like to install a whole new system with both as it gets really hot in the summer - usually it is over 80F going to 100F sometimes for a week or so. In the winter the temperatures drop to 40F rarely to 32F. The house is 2 story, 1991 sf. As we have no experience with HVAC ( our current house has only a furnace) I need some help and info on what I am supposed to ask the dealers. Also it is 2 story house. 1050 downstairs and 850 upstairs. I would like to have 2 zones - one for downstairs and one for upstairs, so that we can control whether it is heating ( cooling) only downstairs or only upstairs. Does this mean that we need separate units for each floor or can it be achieved with only one furnace and AC. Please forgive my total lack of knowledge on the subject.