Joe,
no I mean HDD is heating degree days - a description of our climate, not MBH.
We have two return air drops that connect at the GEO unit both 8"x24". In the past the pressure has been measured and was good, but I don't know what it was.
I am having the sizing verified as we speak. I can tell you that the system didn't cycle much in winter. Did in Summer- of curse.
As far as purchae price, I mean the investment for ME now with having to buy 2 GEO systems in 15 years. That's 30K effectively just for the units. Man, thats a lot of Propane.... Not to mention the loop costs, repair bills, etc..
I am getting numbesr that tell me a Train Heat Pump runs about as much as the GEO (thanks to the tax credits for GEO). So that decision would be based more on better reliability and lingevity of the Heat Pump (which does eventually effect ROI), than cost savings.
In my case, I won't see a real savings with GEO for 20-25 years - thats one LONG payback. Really.
I would be curious to see your ROI analysis. I do ROI analysis for a living. Propane furnances are not that expensive. What is the loop system of the GEO you are proposing, is that in the cost. Duct work? I just don't see how you can have a GEO system with a 4 year payback. Also, in reality does the AC unit really need to be replaced NOW, If that is where your cost savings is, and it can be delayed until failure (which could be years) - or say even SUMMER, that is a factor. Who replaces an AC in October...
Finally, the reality is that if sizing comes in at 5 ton the effect is efficiency, not failures. A little more cycling shouldn't cause the unit to fail so much. Not like this thing has broken down. That's like blaming a car that has had 50 failues on the driver speeding. Will cause some problems, but really. If the technology behind a GEO is so fragile, it shouldn't be sold. |