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David Leech P.Eng

Professional Engineer
Ontario Association Of Home Inspectors - RHI
HVAC Designer since 2006

Meaford Ontario

HVAC Design
Commercial & Residential Inspections
Indoor Air Quality Sampling

Serving HVAC contractors, architects and builders in Ontario.



Company Focus

Heating, Ventilation, and Air-conditioning designs for Residential and Small commercial buildings. Design Protocol is F280 -Residential and Ashrae CLTD or RTS method for Commercial buildings under 6000 square feet and three stories or less. In all cases HRAI™ protocol is used.

Design Applications

• Building permit application; Heat Loss, Heat Gain, Duct Design, Ventilation Summary or Part 6 Ventilation design, and Schedule 1 Designer for Ontario.
• Shell Heat Loss/Gain design for system sizing and energy audit applications.
• HRV design for indoor residential swimming pools


• HRAI™ Right-Suite® Universal software
• Colour printer and Large format 24” black and white HP Designjet.


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