HVAC Design in Aurora
Heat loss and heat gain calculations, duct design, ventilation and radiant layouts — prepared to CSA F280-12 and ready for your building permit application.
ON Point HVAC Design provides HVAC design in Aurora for homeowners, builders, renovators and HVAC contractors. If you need load calculations for a permit, a full mechanical design for a custom build, or a radiant layout your installer can actually work from, that’s what we do.
Did the City return your permit application asking for a heat loss calculation?
This is the most common reason people find this page, so let’s deal with it first.
Ontario municipalities — Aurora included — require a heating and cooling load calculation as part of the permit package for most new homes, additions and many renovations. The Building Code requires that heating and cooling equipment be sized using CSA F280-12, Determining the Required Capacity of Residential Space Heating and Cooling Appliances. A square-footage rule of thumb will not be accepted.
What we send you:
- A room-by-room heat loss and heat gain report calculated to CSA F280-12
- Design temperatures, envelope assumptions and R-values documented so the plans examiner can follow the math
- Recommended equipment capacity ranges (heating, cooling, or both)
- Ventilation requirements per OBC Section 9.32 / CSA F326 where applicable
- [Duct sizing schedule and/or layout drawings — confirm what’s standard vs. add-on]
- Delivered as a [PDF / stamped PDF] you attach directly to your permit submission
What we design
Heat loss and heat gain calculations (CSA F280-12)
The load calculation is the foundation everything else sits on. It answers one question: how much heating and cooling does this specific building actually need?
We calculate it room by room, accounting for the full envelope — insulation values, window type and orientation, air tightness, ceiling heights, exposed walls, infiltration and how each space is used. Not floor area.
Getting it wrong is expensive in both directions. Oversized equipment short-cycles, controls humidity poorly, wears out early and costs more up front. Undersized equipment can’t hold setpoint on a design day. Both produce the same call to the contractor two winters later.
Complete HVAC system design
For new builds, additions and full system replacements:
- Furnace, air conditioner, boiler and heat pump sizing
- Cold-climate heat pump selection and backup heat strategy
- Ductwork sizing, static pressure and airflow distribution
- Supply and return layout, register sizing and placement
- Mechanical room layout and equipment clearances
- Hydronic and combination system design
- Room-by-room load breakdown your installer can commission against
Radiant floor heating design
Radiant is unforgiving of guesswork. Tubing spacing, loop lengths, supply water temperature and zoning all interact — get one wrong and you get cold spots, an overworked boiler, or a floor that takes six hours to respond.
We provide PEX tubing layouts, loop length and spacing calculations, manifold locations and sizing, zoning strategy, mixing and boiler system planning, and heat output verified against the room-by-room load. Installer-ready drawings, not a sketch.
Ventilation and indoor air quality
New Ontario homes are built tight, and tight houses need engineered ventilation, not open windows. We design HRV and ERV systems to meet OBC 9.32 / CSA F326 requirements — total ventilation capacity, principal exhaust, fresh air distribution, duct routing and balancing, and integration with the forced-air system where they share ductwork.
Who we work with
Homeowners planning a renovation, addition, basement finish or system replacement — usually because the City asked for calculations, or because the last system never worked properly and you want the next one sized right.
Builders and general contractors who need mechanical documentation for permit submission on a schedule, without chasing an HVAC contractor for numbers.
HVAC contractors who’d rather subcontract load calculations and duct design than tie up a estimator for a day.
Architects and designers coordinating mechanical requirements into drawings early, before the mechanical room turns out to be too small.
Frequently asked questions
Do I need a heat loss calculation for my Aurora building permit? For most new homes, additions and significant renovations in Ontario, yes. The Building Code requires heating and cooling equipment to be sized to CSA F280-12, and municipalities generally want that calculation as part of the permit package. If you’re not sure whether your project needs one, send us the scope and we’ll tell you straight.
Are your reports accepted for permit submission? Yes. Our reports are prepared to CSA F280-12 and formatted for submission to Ontario municipalities, including Aurora and the rest of York Region.
What do you need from me to start? Floor plans and elevations (PDF or DWG), the intended construction assemblies and insulation levels if you have them, window specifications if selected, and your location. If you don’t have all of it, we’ll work with reasonable assumptions and document them clearly in the report.
Can you design for a renovation or addition? Yes. Additions and renovations often change the load enough that the existing equipment no longer suits the house — sometimes it’s now oversized, not undersized. We calculate the revised whole-house load and tell you whether the existing system can carry it.
Do you design radiant floor heating? Yes — tubing layouts, loop lengths and spacing, manifold sizing and placement, zoning, supply water temperature, and boiler and mixing system planning, verified against the room-by-room heat loss.
Which HVAC design companies serve Aurora? There are several mechanical design firms and HVAC contractors offering load calculations across York Region. If you’re comparing, the questions worth asking any of them: is the calculation done to CSA F280-12, is it room-by-room or whole-house, what’s the turnaround, and does the deliverable include duct sizing or just equipment capacity. We’re happy to answer all four before you commit.