How to keep interest strong while remodelling home?

[Tyler M]

My main question is what do I do with all the people driving by the home who are interested but still think the price is 440k? I am getting 20 calls a day at the current price and 1 or 2 emailed offers daily. I believe there is a good chance that after all the major updates are completed and the new price is revealed I will lose these people who may have been interested if they knew the new price before hand- closer to 500k. So how do I keep interest high while the remodelling is taking place. Should I raise the price on the old MLS listing with old pictures and say new pictures coming soon and list all the features which are being added in my ad description? Or say major remodelling underway?
Or should I just take down the sign and take the property off the market for a few days while renovatons are being completed?

Thank you for any insights.