Arduino thermostat example project

thermostat.ino

#include <DHT.h>
#include <LCD5110_Basic.h>

const int COMFORT_TEMPERATURE = 21;

#define DHTPIN 3      // pin teplotního senzoru
#define DHTTYPE DHT11 // typ teplotního senzoru
#define RELAYPIN 2    // pin relé

LCD5110 myGLCD(8,9,10,11,12);  // piny LCD displeje
DHT dht(DHTPIN, DHTTYPE);

extern uint8_t SmallFont[];
extern uint8_t MediumNumbers[];
extern uint8_t BigNumbers[];

void setup() {
	Serial.begin(9600);
	Serial.println("Thermostat by ATom");
	
	pinMode(RELAYPIN, OUTPUT);   

	dht.begin();
	myGLCD.InitLCD();
}

void loop() {
	int humidity = dht.readHumidity();
	int temperature = dht.readTemperature();

	printLCD(temperature, humidity);
	
	if (temperature < COMFORT_TEMPERATURE) {
		digitalWrite(RELAYPIN, HIGH);		
	} else {
		digitalWrite(RELAYPIN, LOW);		
	}

	delay(500);
}


void printLCD(int temperature, int humidity ) {
	myGLCD.clrScr();
	myGLCD.setFont(SmallFont);
	myGLCD.print("Temp.", LEFT, 10);

	myGLCD.setFont(BigNumbers);
	myGLCD.printNumI(temperature, RIGHT, 0);
	
	myGLCD.setFont(SmallFont);
	myGLCD.print("Humidity", LEFT, 39);
	
	myGLCD.setFont(MediumNumbers);
	myGLCD.printNumI(humidity, RIGHT, 35);
}

I have an uno r3 board and a dht11 . Im not finding any sketch that will verify for me. new and struggling