The 'BELL CURVE' (above) illustrates the relationship between 'operating cost/ time of year'.
MORE cost in the off-season, and LESS (even zero) cost in the warmer months! In Mid Summer, the heat pump may not run at all. The cost spreadsheet (below) assumes a comfortable 27.5 degree pool water, although you may prefer higher   - or lower - temperature for your pool. Cost will rise for each degree higher, as will for operating the unit for a longer period.

Cascade pools with 90mm INFILLFOAM insulated pool walls are heated by sunlight alone and are the warmest type of pool available. Adding a Heat Retention cover will retain this heat. Heat Retention Pool covers are essential in the Spring & Autumn, when the nighttime air is much cooler and a Solar version (Bubble Cover) will also add a few extra degrees to your pool when the sun is shining. In mid summer, a Heat Retention + Solar Cover might make the pool too warm, so remove it and store it safely in the shed until the weather cools i.e. late March. Also remove and store the cover during winter months, or you might remove it in spring to find a 'green' (algae filled) swimming pool!

HEAT PUMP RUNNING COSTS
Updated 2012 This sample using FILTERMASTER HEAT PUMPS Thanks to:
University of Auckland Research
Power cost CONTACT ENERGY Charges 23.33   kW/hr Temperature Required:
Input   27.5   Degrees Centigrade
Heat Pump model  
Cost/Hr
Swiming Season:
POOL COVER  Overnight FM 14 2.6   kW input 0.61  cents Start October to End April
FM 21 3.2  kW input 0.75  cents Pool Size 40 CuM (40,000 l)
AIR TEMP. ALBERT PARK, AUCKLAND The temperature here is generally lower than most Auckland suburbs
July Aug Sept Oct Nov Dec Jan Feb March April  May June
Days 31 31 30 31 31 31 31 28 31 30 31 30
High 15 16 17 18 20 22.5 24 25 23.5 20 17.5 15.5
Low 7 8 10 12 12.5 15 16.5 17 16 14 11 8.5
Average 8.8 9.6 10.8 12 13 15 16.2 16.8 15.8 13.6 11.4 9.6
             
Sunlight adds: 0 0.5 1 1.5 2 4.5 8 7 6 5 4 0
New Total 8.8 10.1 11.8 13.5 15 19.5 24.2 23.8 21.8 18.6 15.4 9.6
             
Temp Increase   17.4 15.7 14 12.5 8 3.3 3.7 5.7 8.9 12.1 17.9
Running Hours              
FM 14 _ _ _ 9 7 5 0 0 4 7 - -
Cost (p/day) _ _ 5.46 4.25 3.03 0.00 0.00 2.43 4.25
Cost (p/mnth) _ _ 169.26 131.65 94.03 0.00 0.00 75.23 127.40
Annual $597.57              
             
FM 21 _ _ _ 5.94 4.62 3.30 0.00 0.00 2.64 4.62 - -
Cost (p/day) 4.44 3.45 2.46 0.00 0.00 1.97 3.45
Cost (p/mnth) 137.49 106.94 76.38 0.00 0.00 61.11 103.49
Annual $485.41              

E&OE - Your results may vary from this research.

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