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Deciding Whether to Buy the Whole System or Only the Unit


If you've just been advised that one of the two main components of your central HVAC system isn't repairable and you need to replace both, it's understandable to question why. It may seem more cost-effective to replace just the failed unit, but that's not the case. Learning about some key factors can help you understand why buying an HVAC system instead of a single unit is a wise decision.

Energy Efficiency

The efficiency ratings on split-systems are based on matching components that are designed to work together. Your system may operate if you add a new indoor or outdoor component, but you won't get the benefit of any increase in efficiency.

Longevity and Reliability

If you mix old and new components, extra strain is put on the existing equipment. At the height of the season when you need the system to operate reliably, that added workload can cause a breakdown or failure that leaves you without any HVAC. You'll have greater peace of mind with an entirely new system that has a 10-15 year expected lifespan.

Lifetime Savings

The boost in efficiency you gain with a complete new HVAC system will bring long-term energy savings, as well as lower maintenance costs and fewer repairs bills. Additionally, you won't have to budget for replacing the other half of the system when it fails in the near future.

New Technology and Features

If you just replace one component instead of buying an HVAC system, you're missing out on an opportunity to increase comfort and lower your operating costs through more advanced technology and features. When you upgrade the entire system, you can choose advantageous features like a scroll compressor, variable-speed air handler, an advanced coil design, or a thermal expansion valve.

Manufacturer's Warranty

A central HVAC system needs to be installed according to the manufacturer's specifications, but that's impossible if you have mismatched components. If you buy half of a whole, you won't have the coverage against defects that comes with a complete system.

Visit our website for in-depth information on most HVAC topics, or just give us a call at (408) 868-5500.

Our goal is to help educate our customers inthe South Bay Peninsula and Santa Cruz areas of California about energy and home comfort issues (specific to HVAC systems).

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