I agree. That money is not sitting there for nothing, it is needed in the near future to make a planned purchase. I only invest for 5 years or more.
You may be able to find a savings account with a slightly better rate with a 90 day withdrawal period. We have them in the UK, don't know if it's a thing where you are. You request the money, and can't have it for 90 days, but the trade-off is a better rate, plus here, 90 days would be fine for you to find a house, have a survey done, do the searches, set a date etc. You would just need to make a request as soon as you found a house.