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David Butler has practiced as a building systems engineer for three decades. During this time he has consulted with multinational manufacturers, energy utilities and land developers on a variety of research and development projects related to energy efficiency.  Butler Résumé

Butler currently resides in the high desert in southeast Arizona where he enjoys performing load calculations and providing mechanical and envelope design services for high performance homes. He's also the founder and administator of the widely acclaimed Home Performance Forum. Butler holds a BS in Business and an MS in Engineering and is an associate member of ASHRAE.

When not working, Butler enjoys music and astronomy. In 2005, he organized an astronomy themed tour of Chile for a small group of amateur astronomers (Chile trip) and maintains an online Yahoo! group dedicated to astronomy in Chile.

Beatrice Richardson is responsible for setting up building models in the load calculation software. Prior to joining Optimal Building Systems, she worked as a CAD technician for the Guentzler Collins Concept Group, a Sierra Vista architectural design firm. She received her AS degree in Drafting and Design at Cochise College.

Beatrice is also a certified optician. She trained at the Balthasar-Neumann School in Germany before relocating to the United States, and is certified by the American Board of Opticianary. Beatrice works at the Sierra Vista Herald, where she is an award-winning photographer. She is also a photography lab assistant at Cochise College.

The Elephant in the Room - HVAC for High Performance Homes
7 Reasons Why Oversizing is Bad
10 Reasons Why Oversizing Persists
Furnaces in High Perf. Homes
ACCA HVAC QI Checklist
The Case Against HRV Systems
The Case Against Partially Conditioned Basements
Point-of-Use Alternatives to Hot Water Circulation Systems
Tankless Water Heaters
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