If you really want to save currency on how you heat and cool your beach house have I got a relaxing suggestion for you! You really do not need to have central heating and cooling system, however every one of us all have been more or less brainwashed over the years that central heating and cooling system is the only way to heat and cool your whole beach house officially.
This is not the case! You can buy a few ductless mini split a/cs, then call your local heating and cooling supplier to have a single of their certified heat and cooling system specialists out to your beach house to convert the ductless mini split a/c into a full blown ductless mini split heating and cooling system unit! This will save you a lot of currency on energy use.
I ended up doing this for our beach house and in the first year of using ductless mini split heating and cooling system, I saved a total of more than four hundred dollars within the year on our electric bills compared to the year before when I was running central heating and cooling system all the time. There is a major difference in energy use, and this is something that the electric companies and the makers of central heating and a/cs do not want you to know. So I am telling you flat out about it now! Buy a few ductless mini split a/cs and have them converted to also do heating and you will save as soon as tomorrow.