3000CFM is probably too much. Your exhaust needs to match your soffit intake in terms of how much air they move. You can't just exhaust air without replacing that air. Find a roofing contractor and not a handy man. If you're forcing 3000CFM out and your soffit vents combined allow for 1000CFM, there are still 2000CFM that need to come from somewhere and it could start coming from your conditioned space through air leaks from things like light fixtures and drywall gaps.
It sounds like you're wanting to vent the attic to cool the house? If so, insulation is your best bet. Yes it may also prevent you from gaining heat in the winter from the sun, but it will also keep the heat from your HVAC inside which is way more efficient than relying on an insignificant amount of heat from a winter sun. We recently increased our insulation to R50 and it has helped lower our bills and equal out the temperature of the house
Our old house in New England has a steep pitched metal roof and no gutters. Our front door is right under a roof valley, so it is unusable on rainy days and all of winter. The water running down the valley has rotted out our building sill, and we have to get it replaced. I don’t want the same thing to happen to the new sill!...
Should be an easy fix. You need snow guards. I’m surprised whoever put the roof on didn’t install them. You should probably have them anywhere that people walk below the roof line as a safety measure. They will hold back the snow and then as it melts it will run into the gutter you need to install. There are lots of different kinds but I would avoid plastic ones or ones that secure only by an adhesive. Depending on the slope, panel profile, and usual snow load you may need a couple of layers of them rather than just one row.
Handyman suggested cutting hole in 1330 sq. ft. attic for second attic ventilator. Does this make sense?
General info:...
Metal roof issue
Our old house in New England has a steep pitched metal roof and no gutters. Our front door is right under a roof valley, so it is unusable on rainy days and all of winter. The water running down the valley has rotted out our building sill, and we have to get it replaced. I don’t want the same thing to happen to the new sill!...