When substituting the outdoor system, should the indoor unit also be replaced?

Our reply is, it’s a smart method. Here's why.

Matched design—Your furnace is designed to function with a matching air conditioner. This might help enhance energy efficiency and performance.

Technology upgrades—There have been abundant recent advances in HVAC technology, especially in energy efficiency, air filtration and quiet running. You’ll have these perks year-round when you improve the whole system.

Improved heating and cooling efficiency—Efficiency ratings are based on matched system performance. While installing one new unit will improve performance, efficiency will be lower from what it was designed to be. And your savings will not be as big as they’d be with a matched system.

Equipment age—If your AC is 10 years old (or older), your heater is likely just as dated. Replacing both means you’ll receive many years of efficient comfort, regardless of the time of year.

Updated warranty—A new set of equipment also means you’ll get new equipment warranties. You’ll receive peace of mind knowing the warranty covers your entire system for the same time period.

It would appear installing just a new AC or heating system can feel like a smart decision. But it’s not a great choice when you factor in lower efficiency.

Installing an entirely new system may be costlier, but you earn much better efficiency, reliability and comfort for many years in Toronto.