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

Our answer is, it’s a wise method. Here's why.

Paired design—Your furnace is designed to work with a paired air conditioner. This can help improve energy efficiency and performance.

Technology advancements—There have been many recent advances in HVAC technology, especially in energy efficiency, air filtration and quiet running. You’ll have these advantages all year when you update both units.

Higher heating and cooling efficiency—Efficiency ratings are based on corresponding unit performance. While adding one new unit will improve performance, efficiency will be lower from what it was engineered to be. And your savings will not be as much as they’d be with matching equipment.

Equipment age—If your air conditioner is 10 years old (or older), your heating system is likely just as dated. Switching both means you’ll receive a lot of of years of efficient comfort, whatever the time of year.

Updated warranty—A new system also means you’ll have up-to-date product warranties. You’ll get peace of mind knowing the warranty covers your complete system for the same time period.

At first glance, installing just a new air conditioner or furnace may appear to be a bargain. But it’s not a great bargain when you factor in lower efficiency.

Getting an entirely new system could be more expensive, but you get much more efficiency, reliability and comfort for long into the future in London.