HVAC Mechanical Systems Design Consulting for pristine Indoor Air Quality (IAQ)

Comprehensive IAQ solutions by Merrel Holley, who has been designing and implementing HVAC mechanical systems for people with allergies, asthma, environmental illness (EI), multiple chemical sensitivities (MCS), and EMF hypersensitivities (EHS) since 1978.

Total control over every parameter of indoor air anywhere in the world, in any climate or environment. Inventor of EnviroConditioner and co-inventor of the Hyperbaric Dome.


Dr. Bill Bright, Founder of Campus Crusades for Christ

“Thank you so very, very much for all you have done to help provide the kind of pure air which¬†Vonette and I so desperately need. How can I ever begin to express our gratitude…?”

Read Letter


see Inn of Regina Caeli