@ramoncarranza
Change the line in the sketch:

temperature = dht.toFahrenheit(temperature);

to

temperature = dht.toCelsius(temperature);

probably? I haven't checked it, just looked at the DHT library. You may need to comment the isMetric line earlier in the sketch too. But I think that's how you do it.

Sorry please disregard, I got it working, the pot just needed trimming down, it was permanently triggered so not reading pulses. It worked straight away as soon as I did that. I thought the green light on the lm393 was a power indicator as it was always on, not pulsing.