My arduino fridge control build.

digitalWrite(ledPin, HIGH); // sets the LED on

#define relayPin 12
#define tempUpPin 2
#define tempDownPin 3
#define ledPin 12
#define tempPin 0


float tempC;
float tempF;
int setPoint = 70;                            // Initializes set point at 70*
long time = 0;
long offTime = 0;
boolean relayOn = false;

void setup()
{
Serial.begin(9600);                           //opens serial port, sets data rate to 9600 bps
pinMode (relayPin, OUTPUT);
pinMode (ledPin, OUTPUT);
pinMode (tempUpPin, INPUT);
pinMode (tempDownPin, INPUT); 
digitalWrite (tempUpPin, HIGH);              // turn on internal pull-up resistor
digitalWrite (tempDownPin, HIGH);            // turn on internal pull-up resistor
//attachInterrupt (0, doTempUp, LOW);          // attach interrupt 0 on pin2 to doTempUp 
//attachInterrupt (1, doTempDown, LOW);        // attach interrupt 1 on pin3 to do temp down

}// end setup

void loop()
{
tempC = analogRead(tempPin);                   //read the value from the sensor
tempC = (5.0 * tempC * 100.0)/1024.0;          //convert the analog data to temperature
tempF = (tempC * 9)/ 5 + 32;                   // converts to fahrenheit
Serial.print ((int) tempC );                   //send the data to the computer

Serial.print(" Celsius, ");
Serial.print ((int) tempF );                   //send the data to the computer
Serial.print(" Fahrenheit, -> ");
Serial.print (" Current Setpoint -> ");
Serial.print (setPoint);
time = millis() / 1000;                                 // Sets time to the current total program runtime in seconds.  
if (tempF > setPoint ) {                                // Compare temp: Temperature is above setpoint
  if ( time - offTime > 300)  {                         // Check to confirm compressor has been off at least 5 minutes set to # of seconds
  digitalWrite( relayPin, HIGH);                        // Turn fridge on
  Serial.print (" fridge on ");
  relayOn = true;
  }
  else {                                                // 5 minute delay is not over
    Serial.print (" Short-cycle delay enabled ");
    }
  }    
else  {                                                 // Temperature is below setpoint
  if (relayOn)  {                                       // Confirm relay is currently on
    digitalWrite( relayPin, LOW);                       // Turn fridge Burner Off.
    Serial.println (" fridge off ");
    relayOn = false;                                    // Set HLT Burner Status to off
    offTime = time;                                     // Time stamps the off time for Burner.
  }
}
Serial.println();  
delay(10000);                                   //wait ten seconds before sending new data

}// end loop
/*
void doTempUp() {
  setPoint ++;                                          // increment setpoint by 1
  Serial.print ("New Setpoint -> ");                    // display to serial  
  Serial.println (setPoint);                                    
  delay (2000);                                          // allow 2 seconds to read message
}// end doTempUp

void doTempDown() {
  setPoint --;                                          // deincrement setpoint by 1
  Serial.print ("New Setpoint -> ");                    // display to serial  
  Serial.println (setPoint);                                    
  delay (2000);                                          // allow 2 seconds to read message
}// end doTempDown
*/