You’re getting warmer. All pyroelectric crystals are also piezoelectric, but not all crystals that are piezoelectric are pyroelectric. The two effects are independent, I.e., they’re not (rpt not) linked. But since you reported good results with Himalayan salt lamps which are supposedly pyroelectric I fear you might be the victim of the placebo-electric effect. 😬
Pop quiz: How do tourmaline hair dryers work?
Pop quiz: How do tourmaline hair dryers work?