If this is not where i should be posting, i apologize and please delete this thread. I'm closing on a house in a few days. The house is in Levittown, Pennsylvania. 3 bed 1 bath rancher "levittowner" as its called. 1000 sq. ft. It has oil burner base board heat. Were looking to switch over to central heat and cooling. I'm not here to ask for pricing. I'm trying to size up a unit. My question is for a 1000 sq ft home about 60 years old, how many tons/Btu's of cooling/heating is suitable for this home? I know that another important factor is how well insulated the walls and roof are but what would be the average size unit in that type of home? Thanks in advance for any input.