AC Installation in Smithville, ON — How the Size Gets Decided Before Anything Is Ordered

Either the house has never had air conditioning, or the system in it has never kept the whole place cool. You have decided on a new AC unit. The first thing a contractor will ask you is what size to buy.

That number is the most important decision in an AC installation in Smithville, and it is the one most of the advice online gets wrong. This page covers the method Ontario requires, the electrical half of the job that rarely gets mentioned, what we fit, and what moves the price. This has been a family business since 2014, and the people who do the fitting hold the 313A, the trade certificate that covers air conditioning work in Ontario.

How an Air Conditioner Gets Sized in Ontario

By a load calculation, not by floor area. Ontario’s Building Code says the capacity “shall be determined in accordance with the requirements of CSA F280”, the Canadian standard for working out how much heating and cooling a house needs. (1)

• It measures the building. Insulation, windows and the direction they face, air leakage, ceiling height.
• It uses climatic data for your location. The Code points to a published table of design conditions for your area, not to anybody’s memory. (1)
• It produces a capacity first. You choose the model after the number, not before it.

A Load Calculation Measures the House, Not the Floor Area

Two houses in West Lincoln can both be 1,800 square feet and need different amounts of cooling. Floor area measures how much room the house contains. It tells you nothing about how much heat gets into it, and removing that heat is the whole job.

Four features of the building do most of the deciding. A wall with three inches of insulation behaves differently from a wall with none. A west-facing window takes four hours of afternoon sun, and the same window facing north takes almost none. A house that leaks air at every joint is pulling outdoor heat in all day whatever the walls are doing. Ceiling height changes how much air there is to cool. None of that shows up in a square-footage figure.

CSA F280 is the standard that turns those four into a number. Ontario’s Building Code then names it directly: “The heating and cooling equipment capacities shall be determined in accordance with the requirements of CSA F280”. (1)

None of this is only a rule for new houses. Repairs or component replacements which change the capacity of an existing system, and which alter how it operates, have to conform to the Code as well. (1) Fitting a bigger or smaller machine than the last one is exactly that.

All of this matters more than average around here, because a lot of the housing stock is older and has been added to over the years. An extension over a garage, or an attic somebody finished, changes what the house needs without changing the footprint much.

The calculation also has to describe the house as it is now. Somebody who insulated an attic or replaced every window since the last system went in has changed the answer. So has an addition, and so has a basement that used to be storage.

So there is one short thing worth asking for. Ask for the load calculation. It exists as a document or it does not.

Part of an AC Installation Is Electrical Work

An outdoor unit needs power, and in a house with no cooling in it yet, that usually means a new circuit from the panel and a disconnect beside the unit. That is electrical work, and Ontario has a separate authority for it.

The Electrical Safety Authority sets out what a licensed contractor files, and what you should end up holding. A Licensed Electrical Contractor “will file the electrical notification of work to the ESA, meaning that they’ll have a permit for the work”, and “will provide an ESA Certificate of Acceptance”. (2)

This matters for a reason beyond the paperwork. ESA puts the consequence plainly: “If you hire an unlicensed electrician who gets hurt on the job, you are responsible. If an insurance claim links to work performed by an unlicensed electrician, your claim may be denied.” (2)

So ask two questions before the work starts: who is doing the electrical part, and whether there will be a Certificate of Acceptance at the end. Both have short answers, and the second one is a document you keep.

The thermostat is the other piece of wiring in this job, and which thermostat ends up on the wall is a decision of its own.

The Equipment We Fit

The air conditioners we install are Rheem, and we hold that manufacturer’s Pro Partner designation. Weatherking, which Rheem also builds, sits at a lower price point, and that matters on the day a load calculation asks for more capacity than the budget expected.

Whichever of them goes in, the efficiency is written on the EnerGuide label. Natural Resources Canada calls that label voluntary on a central air conditioner, so some air conditioners do not carry the label at all. (3) The seasonal energy efficiency ratio on it, the SEER, is the measure, and the higher that number the more efficient the model. (3)

What Decides the Cost of an AC Installation in Smithville

The biggest split is simple: has this house ever had cooling in it? Everything else moves the number by less.

A house with a system already has a concrete pad outside and a pair of insulated copper pipes running to the furnace. It also has a circuit, a disconnect switch, and a cooling coil sitting in the furnace’s air box. Much of that can stay. Where none of it exists, somebody has to put in all five, and each one is a separate piece of work. That is also the line between this page and replacing a system that is already there.

The load calculation is the second thing that moves it, and it is why nobody can price this from the street. The capacity it asks for decides which equipment goes in, and where the outdoor unit can sit decides how far the pipe and the wiring have to travel to reach it.

We do not publish a price. One search for what this costs in Canada returns eight sources answering the same question and no two of their ranges agree, and not one of them has seen your house. You get the number from us once we have measured, with the reasons attached to it. So ask us for a quote on your own house, or call the office and book the visit that measures it.

AC Installation Questions From Smithville Homeowners

What size air conditioner does a 2,000 square foot house need? Floor area does not decide it, which is why the tables online disagree with each other. In Ontario the Building Code says the capacity comes from a CSA F280 load calculation, and that calculation uses insulation, windows, air leakage and the design conditions for your location. (1) Two houses of the same size can land on different answers.

How long does an AC installation take? Usually a day where a system is already there, and longer where the house has had no cooling before, because the electrical work has to happen as well. The measuring and the quote come before that, on a separate visit.

Does a new air conditioner need new ductwork? Not usually, but the ducts decide whether the new capacity reaches the rooms. A correctly sized system will not deliver what the calculation promised if the ducts cannot move that much air. If some rooms never cooled properly before, say so before anything gets ordered, and checking whether the ducts are big enough covers what that involves.

When is the best time of year to have one installed? Spring, before the first hot week. The calls arrive in a handful of days each July, and a system going in while nothing is urgent gets measured, quoted and fitted without anybody rushing.

Is it better to oversize or to undersize? Neither, and the question usually comes up because a size has been proposed with no calculation behind it. A load calculation produces one capacity for your house, and the equipment gets chosen to meet it rather than to beat it. The Building Code asks for that calculation by name. (1) If what you are offered is a size rather than a calculation, ask what the size was based on.

Somebody knocked on my door offering a deal on a new air conditioner. Is that legitimate? Ontario restricts door-to-door selling of air conditioners by name. If you sign a contract for one because of an uninvited visit, that contract “will be considered void and you can keep the goods or services without obligation”. (4) The rule exists because this is one of a short list of products sold that way. However good the offer sounds, close the door and get a second price.

Book an AC Installation Quote in Smithville

Three things are worth knowing before a first visit. Whether the house has any cooling now, roughly where an outdoor unit could sit, and how old the furnace is that would carry the indoor coil.

We work across Beamsville, Grimsby, West Lincoln and Smithville itself. If you are weighing this against a machine that heats as well, the version of this job that also heats the house is the other quote to get. For the wider view, how cooling, ducts and thermostats fit together sits one level above this page.

References

1. Government of Ontario, O. Reg. 332/12: Building Code, under the Building Code Act, 1992 — articles 9.33.1.1 and 9.33.2.2, ontario.ca
2. Electrical Safety Authority, Hire a Licensed Electrical Contractor, esasafe.com
3. Natural Resources Canada, Central air conditioners — EnerGuide, natural-resources.canada.ca
4. Government of Ontario, Door-to-door sales and home service contracts, ontario.ca