The most efficient is a geo-thermal heat pump, if properly installed.
depending on conditions but generally a heat pump will cost you less to run.
Heat pump efficiency can be expressed in SEER rating, with 13 being a mediocre heat pump. Infinity currently has the most efficient energy pump on the market, with a SEER rating of up to 20,5. American Standard, Comfortmaker and TempStart provide units with a 17+ SEER rating.
One of the most energy efficient water heating methods is the heat pump water heater. This method is proven to be two times more efficient over the standard electric water heater.
There is still enough heat in the air to run your heat pump when the temp is in the 30,s
Heat pump - lots more efficient and dramatically cheaper to operate. Heat pump is definitely better as it not only saves electricity bills but is also easy to maintain and install.
There are a few things you need to consider before purchasing a new heat pump. Should you buy a heat pump or should you choose a better choice, for example a furnace? What size heat pump will you need to buy? How efficient do you want your heat pump to be?
There are probably several ways to build a heat pump; for example, a substance might be compressed and expanded. If latent heat is used, this is probably because it is easier and more efficient to build the heat pump that way.
Oil is the most expensive way to heat anything. Check your cost per kwh on your electric bill- easy way= forget all the blah blah and divide the total $ by the total kw. The most efficient heat source is a heat pump. For $400 worth of heat with electric or gas equipment, the same heat may cost you as little as $100.
With heat pumps supply air temp will vary with outdoor temp. The colder it gets outside the less efficient the heat pump will be (colder supply air).
Power showers are more energy efficient in most cases. In a power shower, only a pump is used to pump hot water from a boiler to the shower head as opposed to an electric shower, which has to heat up the water first before being used. Electric showers therefore are not as energy efficient as power showers.
Gas-fired, storage-based water pumps are the most energy efficient type.