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  2. Air changes per hour - Wikipedia

    en.wikipedia.org/wiki/Air_changes_per_hour

    It is measured by the number of air changes per hour (ACH) that occur when there is a differential pressure of 50 pascals between outside and inside the building. If an air volume equal to the inside volume of the building flows across the envelope in one hour, then ACH = 1. [11]

  3. 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.

  4. HVAC acting up? Try these tips - AOL

    www.aol.com/hvac-acting-try-tips-001600634.html

    An HVAC technician can troubleshoot or repair your home’s heating and air conditioning systems. Professional air conditioning maintenance and repairs cost $50-$100 an hour, on average, though ...

  5. Construction estimating software - Wikipedia

    en.wikipedia.org/wiki/Construction_estimating...

    A cost estimator will typically use estimating software to estimate their bid price for a project, which will ultimately become part of a resulting construction contract. Some architects, engineers, construction managers, and others may also use cost estimating software to prepare cost estimates for purposes other than bidding such as budgeting ...

  6. HVAC: REPLACEMENT VS. REPAIR - AOL

    www.aol.com/news/2008-08-15-hvac-replacement-vs...

    For premium support please call: 800-290-4726 more ways to reach us

  7. Cost estimate - Wikipedia

    en.wikipedia.org/wiki/Cost_estimate

    A cost estimate is the approximation of the cost of a program, project, or operation. The cost estimate is the product of the cost estimating process. The cost estimate has a single total value and may have identifiable component values. A problem with a cost overrun can be avoided with a credible, reliable, and accurate cost estimate. A cost ...

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