Is there a way to protect a room from mosquitoes, I am looking for something I can use which does not change the way the room looks from the outside.
Screens are the best solution, and the only solution guaranteed to keep your room 100% bug free (as long as people are careful not to let them in at the door).
Other preventative methods include using mosquito deterrents or repellents like citronella candles, torches, lanterns, etc. There are brands devoted to mosquito control like Thermacell who provide a plethora of products.
Your next best solution is to control the mosquito population in your yard. Preventative methods work the best, by either eliminating breeding areas such as anything that can collect water (spare tires, buckets or pails, ditches that perpetually puddle, swampy areas, etc.), mosquitoes will breed wherever there is standing water. Some mosquitos lay eggs in grass too, keep your grass cut and don't let any areas of you yard get overgrown. Long grass is a haven for mosquitos because they can fly down where they have protection from sun and heat, and also often find water.
Finally, you can treat your yard and kill all the mosquitos before they become a problem. Larvicide any pools, fountains, or ponds that you have in your yard. This kills 99% of the larvae before they mature. Malathion is most popular for killing mature mosquitos in your yard. You can get a bottle with a hose attachment and spray your yard, or you can get a fogger from pretty much any hardware store and fog your yard. Do this the morning of or the night before your event and you're pretty much guaranteed to not have any bug problems that night.
Take steps to control mosquitoes inside and outside your home
- Use screens on windows and doors. Repair holes in screens to keep mosquitoes outside.
- Use air conditioning when available.
- Sleep under a mosquito bed net if air conditioned or screened rooms are not available or if sleeping outdoors.
- Once a week, empty and scrub, turn over, cover, or throw out items that hold water, such as tires, buckets, planters, toys, pools, birdbaths, flowerpots, or trash containers. Check inside and outside your home. Mosquitoes lay eggs near water.
Air conditioning and/or bug nets are used in many parts of the world to protect against mosquitoes.