Then, you should subtract the return air temperature from the supply air temperature. You will find a recommended temperature rise range typically about 35-65 degrees)on the label plate for the furnace. Compare the value you measured with the label plate. If the temperature rise you measured is below the minimum range for your furnace, the blower heating speed can normally be reduced. If the temperature rise you measured is above the high range for your furnace, the blower heating speed can be increased.
Weather Lowdown. December in Istanbul sees the start of winter, with cold temperatures and wet weather. The average temperature is just 8C, with highs of 10C and overnight lows of 6C or below.
The city is the administrative center of the Istanbul Metropolitan Municipality (coterminous with Istanbul Province), both hosting a population of around 14 million residents. Istanbul is one of the world's most populous cities and ranks as world's 5th-largest city proper and the largest European city.Founded on the Sarayburnu promontory around 660 BCE as Byzantium, the city now known as Istanbul developed to become one of the most significant cities in history.resent day Istanbul is a flourishing city, with a constantly growing skyline which is one of the most prominent in all of Europe and Western Asia.