Doooh- I just saw a nice program from penfed.org credit union. Its a 5/5 ARM which only resets every 5 years and its currently at 3.5% with 0pts so you might be able to buy down to 2.5%. If you still have 30+ days before close of escrow then you might want to give them a try since you are trying to play the arbitrage. Currently they are paying closing costs for this loan program!
“5/5 Adjustable Rate Mortgage (ARM) Promotion: We will pay all closing costs to include: Appraisal fee, Tax Service Fee, CLO Access Fee, Title Fees, Transfer Tax Fees, Credit Report Fee, Flood Cert Fee, Recording Fee, Survey if required and Work Verification Fee. Does not include: Escrows, Interest, Home Owner’s Insurance or owner’s title insurance. Available in all 50 states and the District of Columbia. Restrictions apply to existing PenFed mortgage borrowers. You must use one of our preferred title companies to get the closing cost credits.”
“The initial rate can change every 5 years by no more than 2 percentage points up or down, never to exceed 5 percentage points above the initial rate. When the rate adjusts, your new rate will be the then current index plus margin, which is currently set to 2.00 for the new products, as long as it does not exceed the 2% adjustment cap”