Mini-Split vs Central Air: Which Is Right for Your Home?
A direct comparison of ductless mini-splits vs central air — upfront cost, operating efficiency, installation, comfort control, and which wins in each scenario.
HVAC Duct Sizing: Manual D vs Rules of Thumb
How to size HVAC ducts using the Manual D friction rate method and simplified rules of thumb, with duct velocity limits and why wrong sizing causes comfort problems.
HRV vs ERV: Which Recovery Ventilator Does Your Home Need?
Heat Recovery Ventilators vs Energy Recovery Ventilators — how they work, what each recovers, which climate conditions suit each, and how to size them.
Heat Pump vs Gas Furnace: Which Is Cheaper to Run?
Side-by-side operating cost comparison of heat pumps and gas furnaces by climate, electricity rate, and gas price. Break-even analysis and when each wins.
ASHRAE 62.2 Ventilation Requirements: What Your Home Actually Needs
The ASHRAE 62.2 whole-building ventilation formula, why tight construction requires mechanical ventilation, and how to size an HRV, ERV, or exhaust fan to meet the standard.