We are currently in process of replacing furnace and ac and are looking for an independent view on pros and cons of variable speed and single stage units. We are in the Midwest and have a 2 story colonial that is not dual zoned. The second story seems to stay cool with our existing single stage 90% American standard which needs replacing. What are pros and cons of single and variable units? Would a variable speed blower help or hurt the situation on the second story? I acknowledge that This could easily be an insullation issue too hat will not be solved with a furnace.
We have gotten bids for York goodman, Westinghouse and bryantt. Any views on equipment would be appreciated too.