64 percent of most electric bills is for HVAC and Water Heating (more with a pool)
46 percent on average for HVAC
As your main source of comfort from extreme outdoor temperatures, your HVAC system uses the most energy of any single appliance or system at 49 percent of the average Florida home’s energy consumption.
18 percent for water heating
Water heating systems are the second biggest user of electricity in the home, accounting for an average of 18 percent of electricity costs, explains the U.S. Department of Energy.
Variable speed drives (VSDs) can cut a chiller’s annual energy use by up to 30 percent while maintaining operating reliably over a wide range of conditions.
This is accomplished in two ways:
⦁ At part load when cooling capacity can be reduced, a VSD chiller inherently uses less energy than a constant speed chiller whenever the compressor speed can be reduced to more closely match the load.
⦁ At low-lift conditions, when ambient temperature conditions are cooler than design, or chilled water reset is used, or both, up to four times more energy can be saved if the VSD chiller is designed to operate in these off-design conditions.
Performance and Costs of Single stage vs Two stage vs Modulating.
We’re talking about compressor types:
⦁ Basic: A single-stage compressor always operates at 100% capacity
⦁ Better: A two-stage compressor has a low capacity, which is about 70% in most models, and high capacity (100%)
⦁ Best: Variable-capacity (also variable-speed and modulating) compressors vary capacity from about 40% to 100% in increments of less than 1%.
Now, let’s talk about how the pros and cons of each compressor type.
Single stage compressors in ACs and heat pumps have only one speed – 100%. Even if your AC is asked to cool your home one degree, the compressor runs at full capacity.
More energy is used than is necessary, and the system might overcool, since it is still running at full speed when the thermostat setting is met and the AC turns off. All the cold air it has already made is pushed into your home.
If you’re familiar with cars, you know that each vehicle has an optimal speed to achieve the best gas mileage. It certainly isn’t 100% — driving as fast as the car will go!
1). Single-stage SEER is the lowest. The technology is getting better, so the current SEER range for single-stage ACs and heat pumps is 13 on the low end.
2). Two-stage compressors are more efficient because they run on low most of the time. You’ll get better gas mileage driving 70 than 100, right?
Two-stage compressor SEER is in the middle. In current models, it starts at 16 SEER and goes to 19 SEER.
3). Variable-capacity compressors are most efficient. Their lowest speed is about 40%. Even if your home needs more air conditioning, it can boost capacity just a few percentage points when needed. This is much more efficient than starting at 70 and speeding up to 100.
Variable-speed compressors can run at 100%, of course, but speeds above 75% are only needed on the hottest days. The current SEER range for most variable-capacity compressors is 20-24 SEER.
When running a single-stage unit, the “start and stop” of air flow means less air passing through the filter. A two-stage system is a step up, though it fails to meet the air-filtering capabilities of a variable speed system. With the longest running time at a lower speed, the flow of air consistently cycles through the system for the best filtration. This continual air movement also means that hot or cold spots will be reduced or eliminated. An added benefit to clean breathable air.
All ACs have insulation designed to reduce noise. However, some inevitably escapes.
Here are AC sound ranges for each type of unit:
Single stage: 72 to 76 decibels
Two stage: 67 to 76 decibels
Variable capacity: 55 to 76 decibels
All ACs are loud when running at high capacity. But the slower an AC can run, the quieter it can be.
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