Rule of thumb is 1.5 tons per 1000 square feet of home.
There are various factors which go into determining what size heat pump you need for a space. As a rule however, am 1100 sq ft house typically requires around a 3 ton unit.
4-5 tons
3.75
A 4 ton heat pump should be fine, depends on how well your house is insulated. If the house is well insulated you might be fine with a smaller unit.
3.5 Tons
The size of a heat pump that you can use for a pool which is 18 feet wide by 33 feet long and has a depth of 4.5 feet can vary depending on specific brand of heat pump you wish to purchase. The minimum size of heat pump for an above ground pool of this size in 102,000 BTU.
it is a 12 seer 4 ton heat pump
buy a window, thru the wall, or portable unit. you can size it wherever you buy it. they will have a chart of some sort to size it for you.
Check your owners manual for details.
By the cooling load of the home only.
2 1/2 ton heat pump, I believe 12 seer.