Don't forget to factor in the Energy-Star efficiency rating numbers. Many years of use out of a unit is great but more so when it has a lower KWH consumption.
Maybe my math is off but this is an example of how I looked at it the last time we bought one. I'll use the 2.5hp needed and the three Panasonic models I found on the Abenson website.
The most expensive was 72kphp with a ES rating of 6.81, 209.25kwh per month based on 9 hours daily usage. I can't find my last bill but think it was about 12php per KWH. So 209.25 x 12 = 2511php per month. Let's say you leave it on 24 hours a day like I do. 24hrs divided by 9hrs=2.66 times longer. 2511 x 2.66=6679 php per month.
The other two 2.5HP Panasonic models both have a 6.11 ES rating, the least expensive being 62kphp. With the ES rating 6.11 is 243kwh per month based on 9 hours daily. 243x12 = 2916php per month. For 24 hour use 2.66x2916=7756php per month.
At 9 hours per day the monthly difference would be 405php per month. The recoup of the 10hphp will take 24.7 months. The eight year difference will be 38,880php
A 24 hour a day user is looking at a 1077php monthly difference. They should recoup that 10kphp price difference in ten months. The eight rear difference will be 103,392php.
How well the house is insulated, 9 hours, 24hours, price per KHW are all variables of course.


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