The toolbox
Pick a tool. Every result is an estimate to start the conversation, and every final size is confirmed on site by our licensed technicians. Working on water instead? The What’s In Your Water check lives here too.
Furnace and AC sizing
Estimated heat loss for your home and the furnace size range and AC tonnage that fit it.
Gas line sizing
Longest length method off the published sizing tables, for black iron, CSST and copper.
Total gas load
Add up every gas appliance in the house before you add one more.
Duct sizing
Room by room airflow in CFM, with round and rectangular duct sizes.
Combustion air
Is the room big enough for the appliances in it, and if not, how much opening do you need?
What’s In Your Water
The symptom based water check, with a free in-home water test.
Furnace and AC sizing
A simplified Manual J style estimate. We start with a base load per square foot, then adjust for your insulation, windows, ceiling height and your town’s winter design temperature. Bigger is not better: an oversized furnace short cycles, costs more to run, wears out faster and leaves rooms uneven.
Method shown on purpose: base load 30 BTU per hour per sq ft at a 46°C indoor to outdoor difference (22°C inside, -24°C design), adjusted by the factors you picked. The range shown is plus or minus 15 percent, because two houses the same size rarely lose heat the same way.
This is an estimate to start the conversation. Final sizing is confirmed on site by our licensed technicians to code and the manufacturer’s tables.
Gas line sizing
The longest length method, the same approach used in the CSST manufacturer sizing guides: every section is sized from the row for the longest run in the system, using the published capacity tables. Add each appliance, and if you already have a size in mind for a section, pick it and we will flag it if it comes up short.
Appliances on this system
This is an estimate to start the conversation. Final sizing is confirmed on site by our licensed technicians to code and the manufacturer’s tables.
Total gas load
Before any new appliance goes in, the whole house load has to fit the meter and the regulator. List what is already connected, edit any rating to match the appliance nameplate, and see the total.
Natural gas is converted at about 1,000 BTU per cubic foot. Propane is converted at about 2,500 BTU per cubic foot and about 91,500 BTU per gallon. Nameplate ratings always win over the preset starting points.
This is an estimate to start the conversation. Final sizing is confirmed on site by our licensed technicians to code and the manufacturer’s tables.
Duct sizing
Room by room supply airflow for additions, basement finishes and rework. Targets start at about 1 CFM per sq ft and adjust by room type. Sizes come off the standard equal friction duct table at a friction rate of 0.1 in w.c. per 100 ft, the rate most residential systems are designed to.
Room factors used: living areas 1.0 CFM per sq ft, bedrooms 0.9, kitchens 1.2, bathrooms 1.5, basements 0.6. Rectangular sizes shown are one standard equal friction equivalent for the round size. Return air, static pressure and the existing trunk capacity still have to be checked on site.
This is an estimate to start the conversation. Final sizing is confirmed on site by our licensed technicians to code and the manufacturer’s tables.
Combustion air
Gas appliances in an enclosed room need air to burn properly. The standard rule is simple: a room needs about 50 cubic feet of volume for every 1,000 BTU per hour of appliance input in it. If the room is too small or too tight, openings to a larger space or to outdoors make up the difference, sized the way Ontario practice under CSA B149.1 expects.
Openings, when needed, come in pairs: one within about 12 inches of the ceiling and one within about 12 inches of the floor. Free area means the open area after any louver or grille, and grilles block part of the opening, so the cut size is usually larger than the free area figure. A very tight, well sealed room may not get credit for loose construction air leakage, which is one more reason the on site check matters.
This is an estimate to start the conversation. Final sizing is confirmed on site by our licensed technicians to code and the manufacturer’s tables.
Book a visit
A calculator gets you close. A visit gets it exact, with the equipment, the sizing and the options laid out in your home.
Fastest way to book
Call us and we will set a time that suits you. We serve Orangeville, Mono, Shelburne, Grand Valley, Erin, Caledon, Bolton, Alliston, Fergus and the rest of Dufferin County.
Open 8 AM to 8 PM, 7 days a week. Emergencies 24/7.
Keep these tools on your home screen
Add it once and the tools open full screen like a regular app, ready in the furnace room or the mechanical room.
- Tap the Share button in Safari.
- Tap Add to Home Screen.
- Tap Add, and the tools land on your home screen.
- Tap Install app when offered, or open the browser menu.
- Choose Add to Home screen or Install.
- Confirm, and the tools land on your home screen.