Engineer’s Notes
Short, practical notes on the problems that come up in real projects — coil matching, refrigerant transitions, retrofit choices and the details that decide whether an installation goes smoothly.
Engineer’s note · Oct 14, 2026
Zoning Systems for Forced-Air Homes: Design Basics
Zone dampers, a control panel, a bypass damper and per-zone thermostats: how forced-air zoning is designed, and the mistakes that ruin static pressure.
Read →Engineer’s note · Oct 9, 2026
BTU, Ton, SEER, SEER2, HSPF, AFUE: A Plain-English Glossary
What BTU, ton, SEER, SEER2, HSPF, AFUE, SRE and COP actually mean, how they are tested, and which numbers a Canadian distributor should compare.
Read →Engineer’s note · Oct 6, 2026
Whole-House Dehumidifier Sizing: Reading the PPD Table
Pints-per-day ratings only mean something with their test conditions attached. How to read a dehumidifier capacity table and size a ducted unit correctly.
Read →Engineer’s note · Oct 2, 2026
ERV vs HRV: Choosing for Canadian Winters
ERV or HRV for a Canadian house? An engineer's guide to sensible recovery, frost control, core type and the questions to ask before you specify.
Read →Engineer’s note · Sep 30, 2026
Cased vs Uncased Coils: When Each One Wins
Cased and uncased evaporator coils are not interchangeable. A factory engineer explains the cabinet, the duct connection, drainage and the retrofit trade-offs.
Read →Engineer’s note · Sep 26, 2026
Dual-Fuel vs Full Replacement Heat Pump Retrofits in Canada
A factory engineer's comparison of dual-fuel, add-on and full replacement heat pump retrofits in Canada: what changes, what stays, and how to choose.
Read →Engineer’s note · Sep 23, 2026
How to Read an AHRI Match: A Buyer's Checklist
An AHRI match certificate describes a tested combination, not a single box. Here is the field-by-field checklist we use before quoting an A-Coil or outdoor unit.
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