Thank you for all the thoughts! @thepupilI love your logic and well thought out processes. The only additional information I left out was I have three young kids (5,5,1) which will be going to public schools in this town. The town has great school (in Mass) and I can say with a high degree of certainty, we will be in this house until the youngest is atleast graduated from the high school (16 years from now). This is the reason I am leaning towards the fixed rate, however, I do not disagree with your math one bit.