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Discover 3 Things You Need To Know About Your Hvac System - Tricity     It can be through operable windows, louvers, or trickle vents when areas are small and the architecture allows. ASHRAE specified Natural ventilation as the circulation of air through open windows, doors, grilles, and other organized building envelope penetrations, and as being driven by natural and/or artificially produced pressure differentials. In more complex schemes, warm air is allowed to rise and drain high structure openings to the outside (stack impact), causing cool outside air to be drawn into low building openings.     In warm or damp environments, maintaining thermal comfort exclusively via natural ventilation may not be possible. A/c systems are utilized, either as backups or supplements. Air-side economizers also use outside air to condition areas, but do so using fans, ducts, dampers, and control systems to introduce and disperse cool outdoor air when suitable. For ins

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26 Tips for Roofing Company Questions     If the shingles on your roofing system are vanishing as quickly as cake at a young child's birthday party, it's most likely time to change your roofing. Great Day Improvements has actually created this list of 15 questions that every property owner need to ask a possible roofer prior to signing an agreement, so you can guarantee the company you work with is trustworthy and efficient in getting the roofing system done right the very first time around.     Question You Should Ask: Are you licensed? Address You Desire to Hear: Yes, in a lot of states Why You Desire to Hear It: Many states need a roofer be certified in the state; however, all states are different. This implies one code may be required in Boston while another might be required in Nashville. If contractors, including roofers, are required to be accredited in your state, only work with those who are so you have some recourse in case things fail.