![]() ![]() A variable-speed blower, for example, usually runs at a constant low speed to maintain the correct temperature, increasing speed and energy use only as needed. Presence of these gadgets won’t be reflected on their models’ efficiency ratings because ratings are determined while equipment operates at full capacity. When comparing models, look for energy-saving features such as variable-speed blowers and two-stage burners. ![]() But because of the big-time energy savings, hefty tax and utility company incentives and long life spans, it makes financial sense to consider them if you know you’ll be in your house for many years. Ground-source heat pumps (also called geothermal systems) provide very low heating and cooling bills, but these systems are extremely expensive to purchase and install - typically $30,000 or more.Such systems offer low energy costs, but because they are priced a lot more than standard furnace-A/C combos, it takes a long time for their energy savings to offset the extra expenditure. If you’re replacing both your furnace and air conditioner, in this area it makes sense to consider buying a hybrid system that uses a high-efficiency air-source heat pump backed by a gas furnace.For air conditioners, in this area it usually doesn’t make sense to pay more for a highly energy-efficient air conditioner rather than a basic unit.The resulting energy savings from more efficient equipment quickly “pays off” extra purchase costs. For furnaces, it usually makes sense to pay extra for a more efficient unit, compared with buying a minimally efficient model. ![]()
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