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  2. How U.S. home sizes have evolved over time

    www.aol.com/finance/u-home-sizes-evolved-over...

    It’s not that a 2,000-square-foot house costs 10 times as much money to build in Silicon Valley as it does in the Chicago suburbs. It’s really the underlying dirt. That’s the big distinction ...

  3. Best HVAC Systems 2024: Energy Efficiency and Cost Savings - AOL

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    Geothermal Heat Pumps: These systems utilize the constant temperature of the earth to boost efficiency and reduce the operational costs of heating and cooling systems. Geothermal solutions are ...

  4. Ground source heat pump - Wikipedia

    en.wikipedia.org/wiki/Ground_source_heat_pump

    Commercial systems maintenance costs in the US have historically been between $0.11 to $0.22 per m 2 per year in 1996 dollars, much less than the average $0.54 per m 2 per year for conventional HVAC systems.

  5. Does homeowners insurance cover AC? - AOL

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    The cost to replace an outside AC unit can vary widely, depending on where you live, the brand and the size. Expect to pay between $4,350 and $12,000 to replace an outside AC unit, which includes ...

  6. Passive house - Wikipedia

    en.wikipedia.org/wiki/Passive_house

    The passive house standards in Europe set a space heating and cooling energy demand of 15 kWh/m 2 (4,750 BTU/sq ft) per year, and 10 W/m 2 (3.2 Btu/h/sq ft) peak demand. In addition, the total energy to be used in the building operations including heating, cooling, lighting, equipment, hot water, plug loads, etc. is limited to 120 kWh/m 2 ...

  7. Heating, ventilation, and air conditioning - Wikipedia

    en.wikipedia.org/wiki/Heating,_ventilation,_and...

    The three major functions of heating, ventilation, and air conditioning are interrelated, especially with the need to provide thermal comfort and acceptable indoor air quality within reasonable installation, operation, and maintenance costs. HVAC systems can be used in both domestic and commercial environments.

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