🔥 HVAC Contractor Buddy

Rebate estimates, heating and cooling load sizing, energy savings, and ventilation. All math runs in your browser. Nothing is sent anywhere.

Grounded in CSA F280-12 (load calculations), CSA F326 (residential ventilation), and CSA C273.5-11 (air-source heat pump installation). Screening estimates only, not a substitute for a certified room-by-room calculation.

Rebate Calculator

Illustrates how Canadian rebates stack (federal + provincial + municipal), using 2023-24 era amounts. Programs have since changed: always verify current program rules.

Heat Load Estimator (F280-12 method)

Design heat loss from UA x design temperature difference, plus a ventilation allowance. Screening estimate, not a certified F280-12 report.

Print opens your browser dialog. Set Destination to Save as PDF for a shareable file. The report prints the results and every assumption behind them, not the input boxes.

On iPhone: if nothing opens, use the Share button then Print, or open this page in Safari. iOS restricts printing from an installed app.

Cooling Load Estimator (F280-12 method)

Design cooling load split into sensible (dry-bulb) and latent (moisture) at the CSA F280-12 2.5% July design condition. Solar gain is calculated at the 4:00 pm design hour, the way Manual J picks a single peak hour instead of adding up every orientation's own peak. Screening estimate, not a certified F280-12 report.

Detailed window, shading, roof and ventilation inputs (optional)

Leave this closed for a quick screening estimate. Open it to enter real glass areas by direction, which is what separates an F280-12 / Manual J calculation from a rule of thumb. West glass at 4:00 pm is the single biggest cooling driver in most Ontario houses.

Glass area by orientation
Roof, storeys and ductwork
Ventilation (CSA F326) and internal gains

Print opens your browser dialog. Set Destination to Save as PDF for a shareable file. The report prints the results and every assumption behind them, not the input boxes.

On iPhone: if nothing opens, use the Share button then Print, or open this page in Safari. iOS restricts printing from an installed app.

Energy Savings Estimator

Annual heating energy by the degree-day method, priced per fuel. Compares current system to an upgrade.

Water Heater Comparison & Flow Sizing

Compare conventional natural-draft, power-vented, and on-demand (tankless) gas water heaters. Also sizes the peak hot-water flow your fixtures need.

Ventilation Requirement (F326 method)

Minimum whole-house (principal) ventilation capacity by the room-count method used in CSA F326 / OBC 9.32.

Other habitable rooms = living, dining, kitchen, family, rec, den, and similar. Bathrooms and closets are not counted here.

System Comparison: Furnace + AC vs Heat Pump vs Dual-Fuel

Side-by-side heating cost, cooling cost, and rough installed price for the three ways to heat and cool a home. Cooling is essentially identical across all three: a heat pump is an air conditioner that can also run in reverse, so the real decision is about heating.