Understanding Heat Pump Efficiency

Lets face it – should you be looking at purchasing a heat pump, one of the main reasons is probably since they’re quite efficient. The effectiveness of a heat-pump is an essential factor but does need to be considered up with other factors when when creating your final pick.

Why does one need to consider efficiency?
The more effective a heat-pump is, the less it will definitely cost one to run when creating the same amount of heating / cooling. Ultimately your electricity bill is effected by this. When determining which heat-pump to get, therefore, if you’re buying a heat pump and spending the amount of money you should consider its efficacy, in combination with other variables.

How do you calculate Efficiency?
To achieve this accurately you need to find each models “Energy Performance Rating” (EER) for cooling and “Coefficient Of Operation” (COP) for heating system. These amounts will probably be released by the producers. The easiest way to guarantee you get an extremely efficient heat pump would be to pick one that bears the Energy Star” emblem. Only the very best of the best heat pumps (the top 25% of performers in each size) can accomplish this award.

Is efficacy affected by the states of operation?
To make comparisons fair, producers have to test their units’ capacities (and thus efficiencies) at confirmed set of temperatures, when working in a steady and constant way. So, if the specific temperature is not same when you’re running a heat pump, the capability and efficacy will also not be same. At present this is not quite common, although data is also published by a few manufacturers at alternate test conditions. Some producers “ model” or “ compute ” capacity and efficacy at distinct temperatures. This really is just a guess-timate, and is not able to be verified as accurate, thus really should not be under any conditions compared to real data that is tested.

When heat pump slows down does the efficiency change?
Yes it does. All efficiencies quoted are when the warmth pumps are running at 100% capacity (but perhaps not in “boost” mode). With inverter heat pumps, as the room gets near the required temperature, the heat pump minimizes capacity. The warmth pumps efficiency increases, sometimes drastically, when it does this. As it is very hard to create a test which may ensure an even comparison of models and manufacturers at reduced capacity, no data was released for this. This upsurge in efficiency obtained when lowering ability is one of the reasons why it is very crucial that you get a heat-pump that was correctly sized. A heat pump chosen to work mainly round the midst of its own absolute capacity range will end up being considerably more successful than one which is running at mode” that is flat-out or in “ boost the entire time.

How do I work out what a heat pump will cost to run?

You’ll use the heat pump then in case you have the specs for the models you are looking at, know your electricity rate and also the period of time you can compute your running costs. As this really is a bit complicated, listed here is a dining table showing two heat pumps of the same capability, but different efficacies (both have Energystar), running at full power for 4 hrs nightly during winter. Since the heat pumps wouldn’t be running at full-power the complete time, remember, in actuality this might not be less than the price difference. As you are able to see the running cost difference is about $20 per yr.

Is operating cost (efficiency) the only price I must consider when buying a heat-pump?
No it isn’t. To get a real image of your entire costs because a model that is more efficient could cost much more, you also have to think about the price of the heat pump. Any extra price to get the unit will take a little while to refund with reduced operating costs. Using the heat pumps that are same as before, appear in the table here. You can view that although Product A is more successful it costs $250 more to buy. So even though Model A saves $20 per year in running costs it takes around 12 years of operation to get the extra $250 back when in comparison to Model B.