Why Variable Speed Heat Pumps Deliver More Than Just Cooling
Heating and cooling systems are not all created equal. The difference between variable speed and single-stage heat pumps goes far beyond how they cool your home if you are comparing them.

At GreenWorks AC, we care about guiding homeowners in the right direction, not just selling systems. So here is what matters if you decide between a single-stage and a true variable speed heat pump or air conditioner.

What Does Variable Speed Do Differently?
An example of a single-stage system would be a light switch. It’s either 100% on or off. It turns on, blasts air at full power, and turns off again—over and over. This leads to temperature fluctuations and energy loss.

Now, think of cruise control in your car. It adapts seamlessly according to the road. That’s the way inverter-driven, variable-speed systems function. They don’t simply turn on and off—they increase or decrease output depending on precisely how much heating or cooling your home requires at a given moment.

That control changes everything.

Why It Matters
Variable Speed Heat Pumps use this technology to operate in four key aspects more efficiently than single-stage systems:

Temperature Control
Instead of short, intense bursts of heating or cooling, variable-speed systems operate longer at lower speeds. This maintains your home at a consistent, comfortable temperature—no more hot and cold spots.

Humidity Removal
Variable-speed units run more frequently (though more efficiently), so they pull more moisture out of the air. This is especially important in humid environments, where moisture buildup leads to mold, discomfort, or poor air quality.

Ventilation
Longer run times circulate air better. This leads to better airflow, fewer stagnant spots, and more even ventilation throughout rooms.

Air Filtration
The system runs for a longer time, meaning more air can flow through the filter. That translates to cleaner air without using more energy. It’s great if you have pets or allergies or just want to breathe easier.

A Real Comparison
We empirically compared two real-world systems:

Lennox SL25XPV – A full-on inverter-driven variable speed heat pump is also offered for cooling only SL28XCV.

ICP W4H5S — A one-stage heat pump that is sold with various brands.

Note: Lennox or ICP does not sponsor us. This is just a simple comparison to help you make an informed decision!

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