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Interior Doors and Intermittent HVAC Comfort Problems by David Richardson This cooling season, HVAC professionals across the country will be called upon to solve intermittent comfort problems they can't recreate. These frustrating and random problems often involve...
Rick Rohrbacher is the owner of Insight Air located in Phoenix Arizona. In addition to having his second daughter two weeks ago and moving into their new home two weeks from now, it's been a very busy spring at for Rick and the rest of his company. As we spoke with...
When an Induced Draft Appliance (Furnace, Boiler, Water Heater) is "Common Vented" with an Atmospheric Appliance, venting interference can occur. This procedure is the proper method to evaluate this situation and take all precautions to verify safety. Necessary tools...
Air density correction factors have been a part of our air balancing curriculum since the early 1990's. NCI published a small table years ago and encouraged you to make corrections for air density when measuring airflow at higher altitudes. But the accuracy you are...
One test essential to successful CoolMaxx™ service reporting is interpreting fan airflow from the manufacturer's fan data after you measure total external static pressure. As with most HVAC system diagnostic testing, it takes more than textbook learning to become an...
Since the heat has settled over most of the country we have had an increasing number of calls reporting a wide range of methods of implementing the CoolMaxx report. While many of the variations are interesting, after a discussion of how we intended CoolMaxx to be...
Ok, so you've trained your techs on how to test initial system performance with HeatMaxx™. You've got the forms and the right tools. So how do you generate leads form your service calls, and just as important, how do you follow up a lead from a low-scoring HeatMaxx™...
Since the cold has set in we have received many calls and e-mails on PerformanceTalk from contractors and technicians wresting with electric heat systems. The two main topics discussed are: How to determine and rate electric heater performance and how to figure the...
Since the ASHRAE IAQ Standard 62 has been in turmoil for over a decade, we've put together a few rules of thumb to consider when designing and testing fresh air in homes and buildings. Fresh air intake = Occupants in a building X 15 CFM To maintain an adequate...
Adding fresh air to a heating or cooling system accomplishes two primary indoor air quality goals: It helps control building pressures and improves indoor air quality by diluting polluted or stale indoor air. Outside air enters the system through a roof or sidewall...
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