Straight Cool A/C (See Pricing)
Straight cool Condenser with Electric Heating

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Lowest Upfront Cost assuming electrical circuits for heat strips are already in place.
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Common choice for Multi-family dwellings/Rental Units
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Generally not recommended for home owners due to increased heating bills
Heat Pump Systems
Heat Pump Condenser with back up Electric Heat

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Most Common Option
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Best overall Energy Efficiency for All Electric Setups.
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Heat Pump runs on average heating days (32 - 60 deg F).
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Back up electric heat runs in below freezing ambient conditions.
Gas Systems
Straight cool condenser with gas furnace and indoor cooling coil

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Best quality heating - furnaces run hotter than heat pumps, so the air feels nice and crispy.
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Because Gas Furnaces run on 120v and draw low amperage, they can be easily powered with a small generator during power outages.
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Lowest upfront cost when gas piping is already in place and electrical circuitry is not available for back up electric heating.
Duel Fuel Systems
Heat Pump Condenser with gas furnace

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Best of both worlds when it comes to energy efficiency and quality of heat
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Heat Pump runs during during average heating days (32 - 60 deg F).
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Gas Furnace runs when temperatures drop below freezing when heat pumps can't keep up.
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Gas furnace can be powered by a small generator during power outages.
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May require a new thermostat for heating type switch over.