Cincinnati Kitchen Remodel

[Quail Hill]

We're replacing 30 yr old drafty Andersen with contractor recommended Midway vinyl windows and a slider. Under the gun for rebate, but can't find info on whether they qualify - how do I find this. Contractor assured me, I want to know for myself. Table sits near the slider and one other window and we use a space heater to add warmth - don't know if the cold is due to leaky windows, but wondering if it would be wise to upgrade the window or if that makes a difference. Contractor only suggested Midway but hasn't said if it's the top of the line or somewhere in between. Thoughts on Midway or should we look for something else?