How would I apply for a Solar Heating Grant from Gov?

I googled a few things and only found information on Solar Water heating. I’m looking specifically for United States (Maryland) Grant Applications, or any information regarding applying for Solar Heating to heat my whole home.

Any ideas where to look? Because there are tons of Grant sites, some legit, some not. Not to mention that that are sites that talk about tons of different types of solar power for different structures and I wouldn’t know where to start. I just need residential grant info for solar home heating.