A patented climate change solution
The fundamental science of a major climate change solution was first presented in a patent from 1874. It is based on a more efficient hydraulic piston.
HVAC logic improvements
APS has developed many unique HVAC logic circuits: improving comfort and reducing energy consumption. The reductions caused the avoidance of over 60,000 person-years of GHG emissions with a three-person crew.
How efficient are HVAC systems in filtering virus
The APS manual highlights concerns about the effectiveness of HVAC system upgrades in mitigating COVID-19 transmission. While authorities have recommended increasing ventilation and upgrading filters to MERV 13, APS questions the necessity and efficacy of these measures.
A great asset to DDSB
David has been our primary Controls Contractor for last 25 years. We are always surprised that even today he comes up with new and innovative designs.
Letter of support
David Strain’s invention demonstrated an efficiency advantage greater than 15°/o favoring the diamondshaped
actuator over a conventional actuator.