An old heat pump installation was providing unsatisfactory comfort levels and high utility bills for this Carlisle homeowner. Nashoba Air & Boiler Works recommended and installed a new propane two-zone Burnham Alpine propane-fired, gas boiler and two Lennox Signature Series XP25 heat pumps with variable speed air handlers.
The system was set up so that when the outdoor temperatures rise above 36 degrees Fahrenheit, the heat pumps take control of the heating and when temps drop below 36 degrees, the propane boiler would take control.
The homeowner now experiences maximum efficiency and comfort from this new hybrid system. Combined utility bills are one-third lower in peak heating months and almost 50% lower during the shoulder heating months.