Dendrobium question

[Hatteras]

I have three dendrobiums planted togethor in a large pot, in mostly bark. THey have been doing great until today. Two plants are burana white and the third is burana pink stripe. The first white one started blooming sometime in October, the second in November and the pink just finished opening it's last bud this past weekend.

Today, when I came home, I noticed all the flowers look like they are starting to wilt, every one of them, even the last ones to open.

The only change they have been exposed to is we have been using our unvented propane heater. Could this cause a problem, it shouldn't be any worse than a gas stove or oven. The plant looks healthy otherwise. The humidity is low but they have been getting misted a couple of times a day. Any ideas ?

[Zoi2]

If nothing else has changed, I would imagine it is the propane gas. Have you moved the plants to another room?
Joann

[Hatteras]

I moved them to another room when I noticed the drooping flowers, they are the same today. We only use the heater for a few hours in the evening but it was in the same area. Kitchen, dining and living rooms are all in one big open area and the plant was on the kitchen counter.
Does anybody who cooks with a gas stove have this problem ?