February 26, 2017


If you’re reading this, I can safely assume you’ve been considering the pros and cons of having a heat pump system installed in your home. Early on, you’ll be wondering about the differences between the types of HVAC systems available. When speaking to HVAC contractors, you’ll often hear them discussing “single stage” and “two stage” systems, and you might find yourself asking, “what is the difference?”

You’ll notice that two-stage systems are more expensive, and often have higher SEER (Seasonal Energy Efficiency Ratio) ratings.

So what is the difference between single and two-stage? It’s about the compressor inside the unit. Essentially, a single stage compressor has one speed, and that speed is COOL! It’s either on full blast or it’s off. A Two-stage heat pump and air conditioner have a setting in the middle, for milder days where you want temperature control, but don’t need full capacity and the higher operating costs that come it.

Essentially, the two-stage system will run on the lower setting 80% of the time until the external temperature warrants more drastic climate control. This leads to superior comfort and performance.

If you’re considering a new heat pump system, the two-stage setup has a lot of obvious benefits here in the warm Tampa climate:

Energy Efficiency! This is everyone’s favorite buzzword, but it’s accurate. A two-stage system is more economical. It runs more efficiently – often about 40% more efficiently, actually – and thus saves you money. It’s hard to put a price tag on saving money, right? A single stage system with a SEER of 14 or 15 might cost you less upfront, but your bills will be higher.

Better airflow control – two-stage heat pumps also have the ability to vary airflow. You can program the fan motor at a lower airflow volume, which will produce more latent cooling. In layman’s terms, you end up with improved dehumidification, fewer temperature swings, and a higher general comfort level inside the home.

Better seasonal transitions – transitional months like March and October are often hard on single-stage systems. The temperature inside the system can affect its run time capacity, leading to poorer comfort and quality during those transitional months. The two-stage system automatically compensates for this.

Here in Tampa, a two-stage HVAC system has only one real drawback, which is that it can cost more upfront. However, energy savings and utility rebates help offset that drawback over the life of the system. A single-stage heat pump can cost substantially more to run in a year, and those bills may quickly cost you more than you saved by choosing a lower-efficiency system.

Get our best pricing of the year on your next heat pump system when you call 813-701-3430 today ans claim your free estimate!