Hi recently bought another rent house. Main place is fine with ac/heat but the property came with a free standing 400 sq ft mother in law type house on a slab with wood siding. 20x20, fully insulated, double pane windows and steel insulated doors. Only problem is it doesnt have air or heat. Now whats the best way to heat/cool a place this size? I refuse to use propane for heat (its located in rural area) so it must be all electric.
Is this place to small for conventional electric air/heat central unit? What about those window units that ARE air and heat? Are they any good?