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Single-Stage Vs Two-Stage Air Compressor: What’s the Difference?

If you are in the market for a new HVAC system, more than likely you have heard the terms variable-speed, two-speed, and single-speed get thrown around by contractors or friends. But what do these terms mean, and what’s the difference between them?

In the newest blog from Evergreen Heating and Cooling, we’ll discuss the differences between each of these air compressors, as well as the benefits of each. 

Single-Speed Air Compressors

Like a light switch, a single-stage compressor is either on or off. These systems feature a fixed-speed compressor that runs at 100% capacity to reach the desired temperature. After the desired temperature has been reached, the system then turns off.

Benefits of Single-Stage Air Compressors

Single-stage air compressors possess the ability to meet the desired air temperature when running at 100% capacity. These air compressors are also the most affordable option available.

Two-Speed Air Compressors

Similar to a fan switch, two-stage air compressors can be off, on low speed, or high speed. These systems have a two-stage scroll compressor that modulates between either 65% capacity or 100% capacity, allowing two levels of operation: high for hot summer days and low for milder days.

Benefits of Two-Speed Air Compressors 

Two-speed air compressors have longer runtimes and provide more even temperatures, as well as the removal of moisture from the air. This improves indoor air quality and lowers your home’s overall levels of humidity.

Additionally, these compressors have the ability to efficiently shift to 100% to quickly meet desired temperature setting. They have multiple air compressor combinations available to offer additional stages of cooling capacity.

Variable-Speed Air Compressors

Variable-speed systems modulate by varying the speed of the compressor motor, where capacity output increases and decreases with motor speed. These systems feature an indoor variable-speed fan as well as a compressor that operates anywhere between 20-120% capacity, or 900-7,000 RPMs.

Benefits of Variable-Speed Air Compressors

Variable-speed air compressors feature wide turndown capability to deliver more even and consistent temperatures. They can turndown to 900 RPM in cooling mode, which means less cycling and better dehumidification. These compressors also feature 7,000 RPM overspeed capability in heating mode to provide a hot air supply even in extremely cold weather.

If you are debating what kind of system you want in your home, we hope that describing the differences among these air compressors has helped you find a definitive solution. For more information, don’t hesitate to reach out to us. We’re always happy to answer any HVAC-related questions you might have.

Contact Evergreen Heating and Cooling for HVAC Services

Evergreen Heating and Cooling understands that all of this information can quickly become overwhelming and confusing. When making a decision for your home, don’t think that you have to do it all on your own. We’re here to help.

Contact us today to schedule an appointment for service, or to ask us any questions that you might have. We’re available to meet your HVAC needs, no matter what they might look like.

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401 S 13th St,
Waco, TX 76706





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