Thermostat with LCD display - ARDUINO

#include <SoftwareSerial.h>
#include <LiquidCrystal.h>

int buttonState1 = 0;
int buttonState2 = 0;
int lastButtonState1 = 0;
int lastButtonState2 = 0;
float temperature = 21;
int MaxTemperature = 35;
int MinTemperature = 6;
int sensePin = A0;
int RelayPin = 10;
int Hyst = 7;
int sensorInput;
float PreviousTemp;
float Hystersensis = 0.50;
double temp;
int buttonState = 0;
int lastButtonState = 0;
int buttonPushCounter = 3;
char * LOGO = "                Arduino Thermostate                ";


LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
  pinMode(8, INPUT);
  pinMode(9, INPUT);
  pinMode(RelayPin, OUTPUT);
  pinMode(Hyst, INPUT);
  #define PinTempSensor 0
  pinMode(PinTempSensor, INPUT_PULLUP);
  Serial.begin(9600);
  lcd.begin(16, 2);

  for (int letter = 0; letter <= strlen(LOGO) - 16; letter++)
  {
    showLetters(0, letter);
  }
  //delay(2000);
  lcd.clear();
  lcd.setCursor(12, 1);
  lcd.print(temperature);
  lcd.setCursor(14, 1);
  lcd.print(" C");
}
void showLetters(int printStart, int startLetter)
{
  lcd.setCursor(printStart, 0);
  for (int letter = startLetter; letter <= startLetter + 15; letter++) // Print only 16 chars in Line #2 starting 'startLetter'
  {
    lcd.print(LOGO[letter]);
  }
  lcd.print(" ");
  delay(100);
}


void loop() {

 buttonState1 = digitalRead(8);
 buttonState2 = digitalRead(9);
 if (lastButtonState1 < 1)
 {
  if (temperature > MinTemperature)
     {
       if (buttonState1 > 0)
          {
           temperature = temperature -0.5;
           if (temperature < 10)
              {
               lcd.clear();
               lcd.setCursor(14, 1);
               lcd.print(" C");
               lcd.setCursor(10, 1);
              } else
                {
                 lcd.clear();
                 lcd.setCursor(14, 1);
                 lcd.print(" C");
                 lcd.setCursor(9, 1);
                }
        lcd.print(temperature);
        Serial.println(temperature);
        lastButtonState1 = 1;
              }
            }
      }

if (lastButtonState1> 0)
      {
       if (buttonState1 < 1)
          {
           lastButtonState1 = 0;
          }
       }

 if (lastButtonState2 < 1)
 {
  if (temperature < MaxTemperature)
     {
       if (buttonState2 > 0)
          {
           temperature = temperature +0.5;
           if (temperature < 10)
              {
               lcd.clear();
               lcd.setCursor(14, 1);
               lcd.print(" C");
               lcd.setCursor(10, 1);
              } else
                {
                 lcd.clear();
                 lcd.setCursor(14, 1);
                 lcd.print(" C");
                 lcd.setCursor(9, 1);
                }
        lcd.print(temperature);
        Serial.println(temperature);
        lastButtonState2 = 1;
              }
            }
      }
if (lastButtonState2> 0)
      {
       if (buttonState2 < 1)
          {
           lastButtonState2 = 0;
          }
       }
  sensorInput = analogRead(A0);
  temp = (double)sensorInput / 1024;
  temp = temp * 5;
  temp = temp - 0.5;
  temp = temp * 100;


  if (temp >= 0 && temp < 10)
  {
    lcd.setCursor(10,0);
  } else
  {
    if (temp > 9 ) lcd.setCursor(9,0);
  }
  if (temp > 100) lcd.setCursor(8,0);
  if (temp < 0 && temp > -10)
     {
     lcd.setCursor(9,0);
     }
  if (temp < -10)
     {
     lcd.setCursor(8,0);
     }
    lcd.print(temp);

  {
          lcd.setCursor(14, 0);
          lcd.print(" C");
          }

    if (temp == PreviousTemp)
    {

    } else
        {
         lcd.clear();
         PreviousTemp = temp;

           if (temperature < 10)
              {
               lcd.clear();
               lcd.setCursor(14, 1);
               lcd.print(" C");
               lcd.setCursor(10, 1);
              } else
                {
                 lcd.clear();
                 lcd.setCursor(14, 1);
                 lcd.print(" C");
                 lcd.setCursor(9, 1);
                }
        lcd.print(temperature);
        lastButtonState2 = 1;
              }
    if (temp < temperature - Hystersensis)
    {
      digitalWrite(RelayPin,HIGH);
    } else
    {
      digitalWrite(RelayPin,LOW);
    }


  buttonState = digitalRead(Hyst);

  if (buttonState != lastButtonState) {
    if (buttonState == HIGH) {
      buttonPushCounter += 1;
      if (buttonPushCounter > 9) buttonPushCounter = 1;
      Serial.println("on");
      Serial.print("number of button pushes: ");
      if (buttonPushCounter == 1) Hystersensis = 0.00;
      if (buttonPushCounter == 2) Hystersensis = 0.25;
      if (buttonPushCounter == 3) Hystersensis = 0.50;
      if (buttonPushCounter == 4) Hystersensis = 0.75;
      if (buttonPushCounter == 5) Hystersensis = 1.00;
      if (buttonPushCounter == 6) Hystersensis = 1.25;
      if (buttonPushCounter == 7) Hystersensis = 1.50;
      if (buttonPushCounter == 8) Hystersensis = 1.75;
      if (buttonPushCounter == 9) Hystersensis = 2.00;
      lcd.setCursor(1, 1);
      lcd.print(Hystersensis);
      Serial.println(buttonPushCounter);
    } else {
      Serial.println("off");
    }
    delay(5);
  }
  lastButtonState = buttonState;
  if (buttonPushCounter % 4 == 0) {
    digitalWrite(13, HIGH);
  } else {
    digitalWrite(13, LOW);
  }
      lcd.setCursor(1, 1);
      lcd.print(Hystersensis);
  //delay(100);
}