re: How to determine if I should look in to refinancing home?

I just refinanced a 3.625% to a 2.5% 15 yr. will save over 30k in interest with not much change in payment. I’m not in a rush to payoff house but I couldn’t pass it up with that savings. It’ll take a year and a half to makeup the closing costs. I’d look at refinancing if you could make up the costs within 3 or so years and plan on staying in the house long term. Even if I paid more toward my higher rate mortgage I would still have been paying more interest.