I also do something similar but I use the steam from the shower - I put the cal on, run very warm water over the cap to warm it and build up a little steam, then leave it on while I finish my shower. For a longer DT, I wrap my hair in a hot wet washcloth then apply the cap then I put a heating pad over that.

Someone mentioned to me once the hair dryer thing (it was probably you lol) and I tried it - the other options fit in my routine better but the hair dryer was effective. Definitely a good option!
remember, with all advice or suggestions for your hair, YMMV!!
My hair:
2b wavy, medium texture, low porosity, med-high density. Protein finicky.
My routine:
Cleansing: DCNP, every 4-5 days (occasionally use CJ cleansers).
RO: CJSC, occasionally use JCDC
LI: KCKT or CJSL
Gel: KCCC, CJCIAB for 2nd day hair (sometimes third)

Heat is my friend: warm water rinses, steam caps, and diffuse dry. I love CLU cloths and my Denman.