Investment returns are highly correlated with amount of risk. Money in a savings account is effectively zero risk so return is low. Since you have a 5 year period, some CDs might be worth looking at but again return is low. Next up are various bonds but again return is pretty low. Beyond these, there isn't really a low risk option. Since you have 5 years (low range of when stocks make sense), you might consider putting money into stocks (total market ETF) for the next 2 years, slowly transition into bonds and then to cash as you get within 1-2 years of purchase. This assumes that you are willing to be flexible when it comes time to buy. Your investments might go up and you can buy on 3 years or go down and it'll be 7 years (or you buy less house). If you're not flexible then stick to cash, CDs, and some bonds.
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