We will be replacing a 25 yr old gas furnace and AC unit soon in a 4 bedroom house with a full basement and an upstairs. Both are working, but I need to replace the system before winter. Are there other options besides a gas furnance and AC unit? We are in central Illinois, so winters can be very cold and summers very hot. We want a quality system, but one that is energy efficient also.
Thanks for any advice!
Jen and Sam