In the church, the 7 to 14 days are required for cooling and heating process and the variation in the weather as the external temperature induces impact on the internal temperature [6]. For the first, church selected Tucson AZ or Minneapolis MN heating cycle ranging between the initial room temperature and reaches to the maximum value of the temperature and the evidence interferences are related to the external opening of the building [3]. The least square method is applied for the straight line curve. The area of each window is measured and temperature rise of material depends on the thermal conductivity. The thermal conductivity of glass is higher as compare to the concrete. The solution provides the values of the variables and the parameters. The slope of the linear graph gives degrees change per unit time [5].

            The water temperature increases by using the conventional boilers and the industrial grade condensing boiler is used in the process. The conventional boiler was specially designed to detect the flow temperature and time required to rise the flow temperature. There are three states for the operation of boiler [6]. The boiler was initially fully heated up and water was provided at the room temperature, the partly working condition for the boiler is due to the radiations and the water temperature. The boiler is capable of producing heated water to circulate in the church. The boiler partly when reached to the room temperature and the values of the boiler are adjusted to the room thermostat [6].

    The conventional boiler is proposed in the present work, the electricity consumption for the gas boiler in the church is not possible, the thermostat is initially on the different stages and fan blows air on the combustion chamber. The electricity consumption is related to the on and off states. The temperature flow of the church has some room thermostat [6].

        The variation is observed in both lower and upper states. Different time durations are considered for the moment of recording for the temperature. In the analysis the temperature difference was taken after each 6 minutes and the cycle repeats itself. The proportional differences are considered for the external air temperature and the room temperature of the church [3]. The shorter time internal is considered for the recording process. The percentage state of the boiler was around 50% as obtained on the thermostat [6]. The settings were estimated for the energy considerations and were proportional to the differences between the external air temperature and the room temperature [2].

        The situation for the condensing boiler was relatively more complex and the possible modulation was obtained. The electricity was used for the boiler and the consumption graph for the electricity is provided in the Appendix. The full capacity of the boiler is 79% at the first temperature consideration and then reached at 71% when the boiler was turned off and the process switching was based on the time control [6]. The reduction in water temperature was 79% to 71% as with the increase in the temperature of air. The church have room thermostat but still the temperature of the room never reacted to the previously adjusted values. The readings maintained at temperature of 12 deg C [6].      

References of Calibration of model of HVAC project