you should make the investment for sure! my thermostat kicked on this morning (it was set to 65) and it drove me nuts! maybe i should have not left the windows open from when the stove was cranking last night! while you can adjust your stove to burn at a lower temp, you can't adjust a smaller stove to go bigger! That is also assuming you are burning optimally every time.... i think you will be ok with a bigger stove.