I am considering purchasing a Carrier Infinity system with a 96.6 % MVB variable speed or 95 % MVC Modulator variable speed gas furnace. I am trying to find out which is the better way to go with a heat pump 19 seer or a 21 seer air conditioner. I live 40 miles northwest of Philadelphia. I am trying to find out which I would save the most dollars on for electricity and gas and have good comfort. Both electric rates and gas rates will be going up higher in the next 2 years. I have PP&L electric and PECO gas. Is the heat pump more reliable and less costly overall then the air conditioner? Since the compressor will run more on the heat pump for cold and heat will it wear out sooner? I am replacing a York 12 SEER air conditioner and a York 80% gas furnace that are 12 years old. The evaporator coil has a slow leak and they want $1200 dollars to replace it. I have had several other problems with the Air conditioner and a couple with the furnace over the last 12 years. Your help and advice would be greatly appreciated. I need to make a decision by next week because there are rebates up to $1200 dollar which will expire by 6/30/08.
Is it better to go with a modulaing 95% or a variable speed 96.6% and combine it with a heat Pump or Air conditioner?