Why won't my orchids spike! HELP!

[pikuangel]

I have a total of 6 orchids. The only time I have ever gotten any of them to bloom is when I bought them from the store. I have had one orchid for about 4-5 years without a single bloom! I couldn't even tell you what color it is anymore. I have read and read on things to do and I'm still not having any luck. I will post pictures of 3 orchids that I have in different phases that I have heard. First one I haven't cut the stem after the blooms fell off, second one, I cut the stem about the second node, and the third one I cut completely to the leaves. I water them when they are bone dry alternating between a 20-14-13 water soluble orchid food. They are planted in bark and sphag moss. These particular 3 are in south facing windows, 2 in north facing, and one in an east facing. I tried putting one outside in about 80 degree weather in the shade and bringing it in at night to about 72 degrees. Still nothing. I have fans running for air circulation. Lately, I have given up and just kept them where they are where the temperature stays about 74 degrees in air conditioning. Any help would be appreciated!