We had companies calling us about some vacation houses we own ( not rentals) two springs ago when the market was exploding.

They offered about 70% of reasonable, not inflated, mkt value ( neighbor at one place is a realtor and said they were low-balling everyone in the neighborhood, looking for a taker).

I wouldn't do it unless you are truly desperate for the $$. Otherwise maybe try a heloc, if it's not a home affordability issue.