There are many factors to consider while deciding whether to go with a single stage or a dual stage heat pump, when purchasing your new unit. The dual stage is going to be more versatile and can potentially save money in the long run. However there are a few situations where a single stage will do and if this is the case, why spend the extra money? Take the following into careful consideration before making the choice.
A single stage heat pump uses the same rate of transfer at all times during operation. A dual stage (also called a 2 stage), uses 2 different rates of transfer. Put simply, these 2 stages are kind of like a “high” and a “low”. When the desired temperature and measured temperature are fairly close in number, the unit will not need to work as hard, thus using the “low” setting. In this case, a low rate of transfer is all that is necessary for getting to the desired temperature, so why push it and use more energy than is necessary for the job? Conversely, when the difference in temperature is high, and the unit needs to change the temperature several degrees quickly, the dual stage heat pump will switch over to the high rate of transfer and more energy will be used to get the job done.
Since the dual stage heat pumps are a little more expensive, the next couple things to consider are ”Is the dual stage necessary for what I am trying to do?”, and ”At what point will the dual stage heat pump have saved enough energy (money) to have been worth shelling out the extra bucks?” These are questions an HVAC technician should be able to help answer and here are a few other things to consider:
How long is the new system supposed to last? How long will you personally be using the system? Initial costs, energy costs, SEER, and how often you will be using the pump are also factors to consider. HVAC Direct and Goodman both offer dual stage heat pumps in 16 SEER or 18 SEER. They are available in an assortment of sizes, making them ideal for home-owners that are trying to “go green” but aren’t quite ready or don’t have the means to invest in a geothermal heat pump. Take your time, consider everything, speak with a professional (or many), and choose which one will ultimately benefit you more in the long run.