We just moved into a house with a recent shower remodel and the shower is noticably cooler than a regular faucet. I've removed the trim at the handle and I don't see a typical temp limiter like I would expect and it doesn't look like anything I've seen before or like anything I see when I Google the issue. I can't find a brand on any of the shower parts either. It is a single shower with only one outlet. Any help in how to adjust, would be greatly appreciated. I'm really tired of lukewarm showers.