Heat pumps move heat rather than generate it, making them 2–4× more efficient than resistance heating. Modern cold-climate heat pumps (Mitsubishi Hyper-Heat, Bosch IDS, Carrier Infinity) maintain full capacity down to 0°F — well within the range of a southeastern Pennsylvania winter.
Gas furnaces still make sense when natural gas prices are low relative to electricity, when the home already has gas infrastructure, or when the homeowner wants a single dedicated heating system with no cooling component.
For most PA homes replacing both heating and cooling at once, a heat pump paired with a gas furnace backup (dual-fuel system) offers the best of both: heat pump efficiency in mild weather, gas reliability in deep cold.
The right answer depends on your utility rates, existing equipment, and comfort priorities. DMES LLC can run the numbers for your specific home and give you a straight recommendation.
Information provided is general guidance for homeowners. Every home is different — contact DMES LLC for advice specific to your situation.