What size Air Conditioning Unit do I need for 2500 sq foot 2 story home?
you have a number of choices not all of them good ones. as the 5ton unit doesn't keep-up you could upgrade your insulation, and make other improvements to cut your HEAT-GAIN. The advantage of two split systems is one can be shut down when it isn't needed, they would work to help one another if properly installed.hope this gives you options to consider.you could get a 3ton and a 2/21/2ton units
Is 1700 square feet a lot?
Depends on how many people will be living in the house, your taste in furnishings, how much stuff you need to store, etc. This is very subjective.
Average electric bill in Austin, TX?
Average electric bill in Murfreesboro may be different from Austin. My Monthly electric bill also includes water and sewage. I would say it's runs around $275. all three included. Also remember that in Texas we pay no State income tax, which is why it seems that our property taxes are high. Good Luck and Welcome to Austin. You're goin a love it! I just move 2 year and you could pry me out of this place.