We are near Colonial Beach, VA and have a 1282 sq ft manufactured home that has a 550 sq ft open area. In the open area it has a 9ft high vaulted ceiling. There are two 14"x5" rectangular runs of 45-50 feet in length. There are 12 floor vents. 5 of those floor vents are in the 550 sq ft open area. In the link below is what we are considering. ACiQ Extreme Series 2.5 Ton 16.8 SEER2 10kW Mobile Home Electric Furnace & Heat Pump System - R454B Inverter - ACIQ-30-HPD-MH / ACIQ-MH30BU3VWEC / ACIQ-EFS1020FD-MH | HVACDirect.com