Estate for years. An estate for years is one which is to continue for a definite period fixed in advance by. agreement between landlord and tenant. The name is somewhat misleading because the period may be for less. than a year, measured in specific days, weeks, or months. Estate from period to period. An estate from period to period (or periodic tenancy) is one which continues for. periods of time (typically year-to-year, month-to-month, or week-to-week) as designated by landlord and tenant. in their agreement. The most common periodic tenancy is the month-to-month tenancy.
You will still require 8.34 BTU to raise the temperature of a gallon of water one degree F. 1  I say approximately because the weight of water varies slightly with its temperature. 2  Water is at its densest at 4 degrees Celsius (39 degrees F). 3  A gallon of water at temperatures above and below that value will weigh less.
The science behind pool temperatures: To raise the temperature of one gallon of water by one degree Fahrenheit requires 2,100 calories or 8.33 BTUâs. To cool a gallon by one degree requires getting rid of the same amount. Therefore to raise the temperature of a 10,000-gallon pool by 1F would equal 21,000,000 calories or 83,000 BTUâs. The same goes to lower each 10,000-gallons by 1F. The sun can increase the temperature of a pool by 3-4 degrees Fahrenheit on a sunny day. As the pool temperature reaches equilibrium (similar to surf temperature), the daily influence would be less. Heat pumps and chillers are rated by BTU/ hours so you can actually size a unit to provide proper cooling.