we are building a new house with gas heat downstairs and a heat pump for the upstairs. there will be about 1688sq ft dwn and 827 sq ft up. there will be a vaulted great room and hardwood floors downstairs. our builder recommends a gas pack downstairs and a heat pump upstairs. should we do a heat pump downstairs as well since gas prices are so high? my wife doesn't think heat pumps can do the job because of previous experience with one, but i don't know much about it.