===CORRECTIONS===

Sang Hyup:  Hellow, ladies and gentlemen.
Correct:  Hello, ladies and gentlemen. (or Good day ladies and gentlemen!)
Explanation: Since ladies and gentleman is in a formal manner try using the formal greetings like "Good Evening, Good Morning or Good Day" instead of saying "Hi or Hello". Be careful with your word spellings.

Sang Hyup:  Over 40years, my loyal customers have been people who live in tropical areas.
Correct:  Over 40 years, my loyal customers are those who are living in tropical areas.
Explanation: Be reminded of word spacings and you can also use the pronoun "those" for word substitutions in your sentences. The verb "live" should also be in present form "living".

Sang Hyup:  However, the employees in my company develop a new air conditioner it targets people who live in the North Pole.
Correct: However, the employees in my company developed a new air conditioner that targets people who live in the North Pole.
Explanation: Change the verb develop into past form since th action already took place.

Sang Hyup: First of all, it is difficult to maintain the indoor temperature in North Poll.
Correct: First of all, it is difficult to maintain the indoor temperature in North Pole.
Explanation: Be careful of your word spellings.

Sang Hyup: Because temperature of outside always falls to 15degrees below zero.
Correct: Because temperature outside always falls to -15 degrees below zero.
Explanation: Eliminate the word "of" and put the negative sign (-) to indicate the below level of the temperature in zero.

Sang Hyup:  If you set up our products you can relieve of anxiety related to indoor temperature.
Correct: If you'll set up our products you can relieve off the anxiety related to indoor temperature.
Explanation: The "you'll/ you will " should be used instead of "you" for it shows future events that might happen; "off" that emphasize "away from something/someone.

Sang Hyup: Moreover, we know that the house in cold areas has difficulty in ventilation.
Correct: Moreover, we knew that houses in cold areas have difficulty in ventilation.
Explanation: Be consistent with your subject in plural form, it should always agree with its verb; and the past form of the verb "know" to "knew".

Sang Hyup:  You can easily maintaining temperature of your house and can inhale fresh air every day.
Correct: You can easily maintain temperature of your house and can inhale fresh air every day.
Explanation: Just use the base form of the verb in this sentence to show it's in present.

Sang Hyup:  Especially today, discount prices are offered people who buy the air conditioner right now.
Correct: Especially today, discount prices are offered to those who will buy the air conditioner right now.
Explanation: Use the pronoun "those" as word substitution to the subject "people".