Let’s be real—when it comes to HVAC installs, guessing the size of a system is a risky move. You might think you’re saving time, but skipping a proper load calculation can lead to big problems down the line: customer complaints, energy waste, and more service calls than you signed up for.

At Airtek, we supply HVAC pros across Canada with top-quality equipment—from furnaces and heat pumps to ductless units and smart thermostats. We’ve seen firsthand how taking the time to size a system properly makes all the difference—for you and your customers.

So, What’s a Load Calculation?

A load calculation basically tells you how much heating or cooling a space really needs. It takes into account:

• The size of the home or building

• Type and size of windows

• How well the place is insulated

• Ceiling height

• Local climate

• Even how many people live there

It’s the difference between guessing and knowing what size of unit you actually need. You can use tools like CoolCalc, or go with a certified Manual J/N calculation if the job (or rebate program) calls for it.

Why Proper Sizing Is a Big Deal

📉 If the system is too small:

• It runs nonstop and still doesn’t keep the space comfy

• Energy bills go up

• Customers complain

• The unit wears out way faster

📈 If the system is too big:

• It short cycles (turns on/off constantly)

• Temp control becomes uneven

• Can lead to excess humidity and mold issues

• You’re charging the customer for capacity they don’t actually need

Long story short? Oversized or undersized systems just don’t perform well.

How It Helps You as a Dealer or Contractor

Doing a load calc might take a few extra minutes, but it saves you way more time (and stress) later. Here’s how:

• Fewer callbacks – No more fixing comfort complaints

• Better system performance – The unit does what it’s supposed to do

• Happy customers – They stay comfortable and refer you to others

• Rebate eligibility – A lot of rebates (like Greener Homes) require a proper load calculation

It also helps you look professional. You’re not guessing. You’re showing your customer that you’re using real data to give them the best option.

Tools You Can Use

If you’re looking for tools to make this easier, here are a few we recommend:

• CoolCalc – Easy-to-use Manual J load calc tool online

• HVAC Load Explorer – Quick estimates for basic jobs

• Professional services – For larger or complex projects, especially those involving rebates

And if you’re not sure where to start, reach out to us—we’re happy to help guide you through it.

Let Airtek Make It Easier

We know how busy your day can get, and we’re here to make things smoother. When you order from Airtek, you get:

• Help with product selection based on your load calculations

• AHRI-matched systems to support your installs

• Rebate-friendly, energy-efficient products

• Fast shipping across Canada

• Support from real people who know HVAC

Whether you’re working on a new build in Quebec or a retrofit in Manitoba, we’ve got you covered.

Final Thoughts

If there’s one takeaway from all this, it’s simple: Don’t guess. Calculate. A properly sized system means fewer headaches, better installs, and more satisfied customers.

Need help finding the right unit for your next job? Check out our full catalog at airtekshop.com or shoot us a message—we’re always happy to help.