Thinking ahead for early spring temps

[mook1178]

I have been browsing catasetinae photos all day in differing social media groups. I have noticed most are bigger than mine and I put that up to mine being seedlings. Then I was looking at SVO facebook page. I saw the Ctsm calloum x Ctsm tenebrosum cross that I have. The flower pic was posted on May 30. I also saw others posted in the comments the next few days.

My 2 plants seem to be way behind. One lost the bloom spike due to a slug, but this is the smaller plant of my 2. The larger plant I am expecting to bloom by the end of June. I started to wonder if it is due to the temps in my house during the early spring. I keep my house in the mid to upper 60's when the heat is on, which it usually stays on through March and April can be hit or miss. So my catasetinae are probably too cool at that time of year while the new growth develops.

Will I be able to use a heating pad with the plants sitting on top or would a temporary terrarium setup be that much better to be worth the hassle?