Derek Cole explains variable-speed HVAC systems using a car analogy: older systems run at full speed constantly, like flooring the accelerator, while modern systems run at low speed about 60% of the time and only kick to high speed during extreme temperatures. This saves energy and money.
Okay.
What is variable speed?
Very good question. That was kind of loud. Variable speed. So I think I mentioned last episode about thinking about miles per gallon when you're thinking about runtime. Variable speed is kind of the same way. If you— your system, or the older systems, have just one speed on 100% ready to go. So it would be equivalent to you driving out of your driveway and then hitting it to 55 as soon as possible. So is that more efficient, or is it more efficient for you to actually slowly gear up and speed up, uh, to get to your speed? So variable speed's kind of that same, uh, dynamic for your system. So most variable speeds are 2-speed systems. So you have a variable speed indoor motor. So it's only going to run on high speed when it has a big demand. So if it's really hot, really cold outside, and you need that extra power to get to 75, whatever the set point is, it's going to get there with the high speed. But 60% of the time, roughly, it's going to run on low speed. So that will save you a lot of money because We're sizing your house at 3 tons, for example, on a 95-degree day. Well, how many of those do we actually have during the summer? You know, we might have a few weeks of 90s and then we're in the 80s and 70s and nighttime gets down to 70. So variable speed and two-speed systems really save you a lot of energy because you're not running on high speed. Turn it off. High speed, turn it off. You're running on low speed most of the time. High speed when you really need it, and then you're turning it off.
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