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The Benefits of a Variable Speed HVAC System

Everybody wants their home at a comfortable temperature all year without paying excessive utility costs for it. Enter the variable-speed HVAC system.

Advances in the cooling and heating industry are making our central air appliances more efficient than ever. The introduction of variable-speed drive (VSD) technology is among the latest improvements to the modern central air unit, improving more reliable and consistent comfort while using less energy.

The Need for Variable Speed

An HVAC system with VSD technology operates at different speeds to distribute warm and cool air throughout the home. This is a drastic improvement over the conventional single-speed HVAC system which runs full-blast until the home reaches a set temperature then abruptly switches off.

Here’s why operating at slower speeds matters: Say it’s 80 degrees outside and your thermostat is set to 76 degrees. A single-speed system will kick on at full capacity to overcome a measly 4 degrees. That’s overkill. In contrast, a modulating AC system will bring the temperature down at a much lower capacity.

Because the variable-speed motor operates longer at slower speeds, it consumes less energy and provides more accurate temperature control.

Variable Speed Compressor

The heart of a heat pump or air conditioning system is its compressor. This is the component that transfers heat from a building to the outside air. A variable-speed compressor can run at almost any speed from 30 percent up to 100 percent depending on temperature fluctuations outside. This makes it possible to easily increase output during an exceptionally hot day or throttle down for cooler days.

Variable Speed Fan Motor

Variable-speed drive technology also applies to the blower mower located in a gas furnace or air handler. Various speeds can be used by the blower motor to accurately control the level of airflow throughout a house.

What Makes Variable Speed Efficient?

It’s convenient that it’s called variable-speed drive technology because the easiest way to understand it is to think about driving. Just like your car gets better MPG on the freeway than in the city, a variable-speed HVAC system will use less energy because there are fewer stop and start cycles.

The steady, slower speed of the VSD compressor and blower motor decrease electrical demand. Once a variable HVAC system reaches the appropriate temperature, its variable design can be more precisely adjusted to meet the demands of its environment.

More Benefits

The lower and slower rates of VSD provides several other benefits.

More even temperatures: The abrupt on-off cycles of a fixed-speed HVAC system means your home will have to get warm before it kicks on. A variable-speed central air system solves this by delivering a steady stream of conditioned air for longer periods for more accurate climate control. It prolongs a set temperature and maintains consistent indoor comfort.

Better humidity control: A feature that every Floridian should appreciate. An HVAC system that runs longer will remove more moisture from indoor air. This will make the balance between humidity and temperature much better. It will provide the best possible indoor air.

Quieter operation: A single-speed HVAC system can sound like a jet turbine when compared to VSD unit. Again, that’s because it operates at a lower rate.

Bottom line: Single-stage technology has shorter cycles running at full capacity. Variable speed technology runs at a lower setting for longer periods. This results in a system that is more cost-effective to operate. It also provides the most dependable indoor climate control possible. WEATHER ENGINEERS is an award-winning, family-owned business that has been providing reliable HVAC system installations throughout Melbourne since 1976. If you’re interested in upgrading to a more efficient system, contact us today at (321) 727-2542.

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