I love do-it-yourself projects! It’s a great way to save money, and I believe every homeowner should be self-reliant. When it comes to changing thermostats there’s online sources like this one at The Home Depot and this informative post about choosing Thermostats. Many sites advocate that you (the homeowner) should easily be able to switch
A joist panned duct isn’t the best idea to begin with. Placing one where two LVL’s come together is adding restriction and air leaks. Nobody wants to find this in the space that affects air quality of the entire main floor of a home. But this is what happens when joist panning is done poorly.