The time has come to replace my current Geo unit which is a Waterfurance Series 2 built in 1995. Last year the fan motor went, now the coil leaks, and the compressor is obsolete. so time for a new unit. I am getting quotes for replacements units. My the current unit is rated at 57000 BTU which translates to ~4.75 ton unit. The first two companies have come in and assumed to replace the unit with a 5 ton unit. both guys said that the loop is engineered to the size of the unit which makes practical sense to me. Heck 4.75 rounds up to tons rather than going down to 4 tons. I am having other companies come in and give quotes...should I be expecting them to just assume a 5 ton unit or should I be expecting a J load calculation? Are there any other things to watch out for? From my general survey of options...it looks like most brands offer a good, better, best levels of units. I am leaning toward the "better" level of option. In general the differences in better and best is a variable compressor, instead of a two stage , and a better control system. For my application I have a single zone house and of an opinion with these geo units to "set it and forgot it" and not touch the thermostat at all. So for me the fancy control systems seem just like a marketing tool...am I off base? Sure variable displacement compressors will incremental be more efficient, however I am not sure I would recoup the incremental acquisition costs over the life of the unit. Additionally I would expect variable compressors would be more costly to replace in the future. Any feedback?