In today's mortgage market every $1000 that you borrow will cost you about $6 per month. So if you look at energy-saving improvements in terms of what they save you, on average, per month, you can easily translate that into loan value.
For example, replacing an old washing machine with a new one that has an Energy Star rating, can save you $100 per year. That's about $8 per month, which translates to about $1333 in added value. This kind of calcualtion assumes that your improvement will last as long as your mortgage, which is frequently not the case. But you can keep the calculation accurate by including the fraction of years that the improvement is expected to last. If you expect your washing machine to last 10 years and you have a 30-year morgage, just take a third of the value, or $444.
So if you want to translate solar panel energy savings into home value, just devide monthly costs by $6 and multiply by $1000. Then factor in the number of years you expect the improvement to last, and you should also figure in maintenance expenses that you anticipate.
This calculation is working years into the future, when energy prices can change and if you have an adjustable rate morgage, the cost of borrowing can go up, which will all change the balance. If energy prices go up, the value of your improvement goes up. If morgage rates go up, the value of your improvement decreases (because the cost of borrowing increases, so you need to provide more of a benefit to justify the same value).
I should also mention that this is just a calculated value, so while it's useful information, it isn't cash in your pocket. The market determines the value of a house, so if you want to sell a house with these kinds of improvements and you want to get that increased value out of your sale, you need to do some work. You'll need to put some effort into selling the various energy improvements of your house, and how you do that is really up to you. I might be inclined to print up a sheet explaining the various energy savings your house provides and making buyers aware of the issue of utilities costs. Most people, when buying a house, assume that all houses will be the same when it comes to the costs of heat/water/electricity. So you need to get them thinking about that as they look at your house, and hopefully take that information away with them as they look at other houses.
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