Having worked in a certified sick building where the air handling system was not adequate for the building I think everyone should open their doors and windows when they can. If you do not have screens you need to wait for colder weather for that. I have not found that those bags did anything to reduce house odors. They are also sold to absorb moisture but they also fail at that. Better solution is have several pedestal fans. The only odor absorbing things that do seem to work without sending clouds of scent into the air are those flat disks that you can find at wally world and other places. I have a multiple cat house and keep one near the litter areas. Sorry they come with a wrap and I have none that still have the wrapping on.

I don't have a Wally World.

I have seen them other places such as my grocery store or target,

All interior spaces need daily fresh air. even in times of extreme weather (hot or cold or humid).

The not free but most comprehensive way to do it in a house is to have an ERV or HRV fresh air device installed by an HVAC contractor. They bring in outside air and temper the incoming air using outgoing air (using a heat exchanger to extract the heat or coolness, depending on the season) to avoid the extreme temperature differences. The fresh air is realesed either directly into a room through a vent or into an existing HVAC system duct.

A no-cost way to bring in regular outside air is to turn on a bathroom exhaust fan, leave the bathroom door open and then open a window an inch or two in a different part of the house. You should feel an incoming airflow through the open window and that works even if there's no breeze at all outside.

The old fashioned way still works too - open two (not one) windows on opposite sides of the home.

Eld, what is older? This is a 1955 sprawled out ranch/MCM.

We are open window people. Even in this mild coastal climate, I suppose that leads to some extra expense but worth it. The two of us have arrived at a point where we almost cannot sleep in a closed room, and have a window at least cracked a bit no matter what month of the year. Every window and door to this house is screened - I like air, not bugs.

This house has gas heat, radiant in the ceilings. It's comfy. I miss my heat pump with whole house air cleaner in my former house (I rarely had to dust and now I do). This home is much nicer overall, but I miss 1) the air cleaner and I'd have to start from scratch with all duct work here 2) skylights in the bathroom that provided the world's best makeup and hair light 3) some of the neighbors.