What are some ways I can close up my lani screened porch.

There are companies which make sun room enclosures for patios. I believe they can be done in plexiglass as well as tempered glass but don't know what they might cost. It looks like you have a ceiling fan, make sure it is NOT a ceiling hugger as that will not do anything. It needs to be hung at least 10/12 inches down from the ceiling for good air circulation and keep it going. That may help prevent some mold but not dirt. You'll probably need to power wash everything with a bleach solution when pollen season is over and then again in the fall after that pollen season. Good luck.

Why not Glaze it or use Exterior Plexiglass or Polycarbonate ?

easy breeze vinyl windows installed by a qualified company

I enclosed a screened porch years ago with custom storm windows. It was a small mom and pop company that built to size. I enclosed 1/2 way up with cedar paneling, sheet rocked insulated the bottom. The exterior could be what complements your home best. Then, I had double hung windows the rest of the way. I liked it. Enclosing 1/2 way gave us some privacy but still afforded the luxury of watching nature. I'd say it would be possible, with some framing, to put storm windows top to bottom.

Start by looking on Home Advisor for a carpenter that can make a frame, and add just screens. If this faces the north, your going to get mold. You have to keep it dry

Use Windows old ones

Where do you live? Do you need it fully closed off so you can heat it or are you southern enough that simple plastic will do?

i live in CT where winters get tough and I built frames with common boards and stapled plastic onto them. I used a thick milk so even the one that says clear blocks the view but I needed them to block snow from covering my back porch and view was not as important. I screw mine in each year but you could use hooks and eyes or even heavy duty Velcro to hold them in place. Mine are almost 10 years old and have lasted through many rough winters

I would get a qualified carpenter to enclose and add functioning windows . This would allow you to open them later and use the space as a sunroom. If you want privacy simply add blinds to the windows.

Use the fan a lot to keep the humidity down, that will help with the mold and mildew that you get in the lanai. Whenever you see mold starting, clean with bleach water and rinse with a spray of vinegar to kill the spores, this will help keep the mold down somewhat. When we lives in Naples, the covered part of the lanai always got green mold on the cement, but not the part with the screen roof. It was much more humid under the roofed part. We used Muriatic acid on the sidewalks to keep them clean. Perhaps if you close in the lower parts of the screens it will help with the dust and dirt that blows in with the wind. You could put up some type of thin plastic or aluminum panels with something like automotive silicone that can stand up to heat and moisture. Shades that you can pull down while you are not using the lanai would help with the upper part of the screens not letting in dust and dirt.

We enclosed our back patio. Have 3 windows, 1 large sliding glass door and 2 skylights. We put a fan on the ceiling. It is located in front of a window and blows cool air into the kitchen in the summer. Also above a wood burning stove so it blows warm air in the winter. We use cheap wooden roll up blinds in the summer to keep the hot sun out.

I used very full and very inexpensive net curtains from ikea. The also have a wire hanging system which works amazingly around corners. I hung the net drapes with little metal clips that hold them onto the wire 'rods'. I have privacy, but still full view and breeze. The clips also swing the curtains open and closed with a simple swish. The net drapes are 5.00 a pair, and each panel is over 100 inches wide.

Depending on where you live, there are Building Codes, actually Health & Safety Codes that regulate how one encloses porches & lanais.

This is because of the mold, as noted. Black mold is toxic and is the subject of many lawsuits.

I would concentrate on stopping water from getting inside, to begin with. As in concentrate on exterior shutters, or barn-door sliding screens made of plexiglass or translucent exterior grade plastic.

Yes an Exterior Grade Fan is a good idea, be careful about exterior wiring. Hire a handyman or electrician if unsure.,