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2. 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 ...

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. Glossary of HVAC terms - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_HVAC_terms

   The goal of HVAC design is to balance indoor environmental comfort with other factors such as installation cost, ease of maintenance, and energy efficiency. The discipline of HVAC includes a large number of specialized terms and acronyms, many of which are summarized in this glossary. air changes per hour

5. Availability - Wikipedia

   en.wikipedia.org/wiki/Availability

   If we are using equipment which has a mean time to failure (MTTF) of 81.5 years and mean time to repair (MTTR) of 1 hour: MTTF in hours = 81.5 × 365 × 24 = 713940 (This is a reliability parameter and often has a high level of uncertainty!) Inherent availability (Ai) = 713940 / (713940+1) = 713940 / 713941 = 99.999860%

6. Flat rate - Wikipedia

   en.wikipedia.org/wiki/Flat_rate

   A flat fee, also referred to as a flat rate or a linear rate refers to a pricing structure that charges a single fixed fee for a service, regardless of usage. [1] Less commonly, the term may refer to a rate that does not vary with usage or time of use.

7. AOL.com - My AOL

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   AOL latest headlines, news articles on business, entertainment, health and world events.