One of the better Single Stage Air Conditioner System from Trane is the Trane RunTru 3 Ton 14 SEER Single Stage 36000 BTU Electric AC System. This package contains (1) Trane RunTru 3 Ton 14 SEER A4AC4 Series 36000 BTU Single Stage Air Conditioner Condenser A4AC4036A1000A, (2) Trane RunTru A4AH4 Series 3 Ton 14 SEER 36000 BTU Single Stage Multi-Position 1/2 HP Air Handler A4AH4P36A1B30A and (3) Trane 10 kW 34121 BTU Single Phase Electric Heat Kit BAYHTR1517BRK.