Yes, it is very common that customers with 3000+ sq. ft. homes will require multiple heat pumps in order to effectively heat their demand load with heat pump generated energy. Our systems are modular in that two of our 060A 60K BTU heat pumps would combine for a total of 120K BTU production. It is also the case that a single heat pump system can be expanded upon in future to include multiple heat pumps if additional home heating space was ever added.