hi, I'm new to this and not sure if I'm doing this properly but I have a G20RQ3E-75-3 lennox gas furnace that has somethng wrong with the spark ignitor. what happens is that it clicks once and then the heater just humms. No pilot light soparking that I can see and usuaLLY IT CLICKS 5 TIMES OR SO BEFORE IT STARTS BUT NOT DOING that anymore. please advise

Hi all, Just bought a 1200 sq ft 1962 Rambler south of Seattle, WA a month ago. Kicked on the brand new 92% Payne forced air furnace last week and was surprised by how loud the sole return air register is. The furnace is located in a bedroom closet (down-flow position), as there is only a crawl space. The return air register is in the hallway right outside the furnace (this is not a central location of the house) near the ceiling. I had an HVAC mechanic stop by to check it out, figuring I will need to add more returns, but he just advised moving the return to the central living room/kitchen area (above the hallway entrance in photo 3) with flexible duct through the attic space. Seemed like a good suggestion to reduce the noise. He indicated having only one return was normal. Then I started researching airflow and circulation and have hit a bunch of contradictory info leaving me confused about the best course of action. Some sources say you should have cold air returns in every room for the most efficient heating, others seem to indicate having only one return is fine? Some say the returns should be near the floor (makes sense), others seem to install near the ceiling? Then there's undercutting the doors or adding grates to them so when they are closed at night you still get proper circulation? Any thoughts would be greatly appreciated. I have replaced a few furnaces in my day and run duct work, but never had a great idea of the proper layouts for maximizing efficiency. Thanks! [ATTACH]40469[/ATTACH][ATTACH]40470[/ATTACH][ATTACH]40466[/ATTACH]