The code

======

/*
Testing LM36 thermometer
Signal leg connected to ANALOG Input AO

RElay IN leg connected to pin 9.
By Yohi Zucker
March 18th 2016
*/
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
const int button1Pin = 2;  // pushbutton 1 pin
const int button2Pin = 3;  // pushbutton 2 pin
float Temp;//Temperature variable
int Sensorpin = A0;//Read the temp sensor output
const int ledPin1 =  12;    // LED pin1
const int ledPin2 =  13;    // LED pin2
const int relayPin = 9;     // Pin to actuate the relay
int SetTemp = 10;

void setup() {
  pinMode(button1Pin, INPUT);
  pinMode(button2Pin, INPUT);
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(relayPin, OUTPUT);
  Serial.begin(9600);
  lcd.begin(16, 2);
  lcd.backlight();
  lcd.setCursor(2, 0);
  lcd.print ("Temperature");
}

void loop() {
  int button1State, button2State;  // variables to hold the pushbutton states
  button1State = digitalRead(button1Pin);
  button2State = digitalRead(button2Pin);

  if (button1State == LOW)
  {
    SetTemp = SetTemp - 1;
  }
  if (button2State == LOW)
  {
    SetTemp = SetTemp + 1;
  }
  if (SetTemp == 9)
  {
    SetTemp = 10;
  }
  if (SetTemp == 100)
  {
    SetTemp = 99;
  }
  lcd.setCursor(10, 1);
  lcd.print("Set=");
  lcd.setCursor(14, 1);
  lcd.print(SetTemp);

  //Serial.print( button1State);
  //Serial.println( button2State);
  delay(250);
  lcd.setCursor(0, 1);

  Temp = (5.0 * analogRead(Sensorpin) * 100.0) / 1024;
  lcd.print(Temp);
  lcd.print("C");
  //  Serial.print("Temperature= ");
  //Serial.print(Temp);
  //Serial.println("C");
  //delay(1000);
  if (Temp > SetTemp)
  {
    digitalWrite(ledPin2 , HIGH);
    digitalWrite(ledPin1 , LOW);
    digitalWrite(relayPin, HIGH);
  }
  else
  {
    digitalWrite(ledPin2 , LOW);
    digitalWrite(ledPin1 , HIGH);
    digitalWrite(relayPin, LOW);
  }
}