New investment property/house hacking lender question

[Jeremy P.]

Help please. I am considering buying my first 2-4 unit investment property that I may live in (house hack). My question is this: what if I get a loan at a low interest rate with the assumption that it will be my primary residence (interest rates are lower if I live in the unit vs a pure investment property), but then after I buy it I change my mind and decide not to live there (instead I rent all units out)? Is my original interest rate still locked in? For reference, I am currently renting and do not own a primary residence.