Just bought a 1185 sq ft townhouse & I’m looking at my system trying to figure out what I need to do, if anything. I have a 2 ton AC unit (not a heat pump) with a NG gas furnace, also have a gas water heater. The unit was made in 2010 and has a newer compressor. It’s a 13 seer unit and I live in region 4 on the map. The unit is a HEIL and I see it gets bad, bad reviews online. I’m considering replacing it at tax time early next year so I’m doing my research. Should I stay with a AC unit only with a new gas furnace. (gas heat is nice & warm) Should I go with a heat pump with a gas furnace to back it up. Should I go with one of the variable speed units, more upfront cost I know or a 2 stage unit. What seer rating would be the min you would recommend? Finally any brands? I like American Standard as we have a ton of them at work and they require the least amount of service work of all our brands. I know a Goodman is also great in my limited experience as that’s all I have ever owned plus that’s all my Dad would install, mine at the old home is 10 years old and never been touched. My goal is of course reliability but a close second is I want the most energy efficient system that I can afford and I don’t care to pay more upfront for many years of cheaper energy bills. Thanks for any and all info.