Guitar collection needs good indoor air quality

My brother frequently travels the world with only a guitar and backpack.

He has a whole guitar collection that he stores at my house.

When he leaves, he just picks one and sticks with it. I am allowed to hang onto the guitars because I treat them right. I don’t play, but I love the look of them. I have a whole room that is set up for the guitar collection. I had a custom furniture guy make shelving units within the walls for each guitar. They can sit up off the ground and be displayed. They are hidden in the wall so dust doesn’t get into them. I also invested in good HVAC equipment for the room. Wood and electronics can seriously get injured by poor indoor air conditions. Too much humidity in the air quality causes wood to swell. Dry indoor air conditions will cause wood to crack. Moisture allows for bugs, mold and mildew. Dryness permits static shock. So I have both a dehumidifier and humidifier that work with my HVAC unit. The HVAC is just for the guitar room. In the summer the AC and dehumidifier keep the space an even temperature. In the winter the humidifier works with the heater. Nothing is ever damaged and the space is kept perfect. The last thing I want is for my brother to come back home to a ruined guitar collection. I am hoping someday I will inherit a few of them. If not, I am just happy with keeping them in ideal condition for when he does want to play them.

Heating system