Looking for someone to critque our marketting campaign

Hi all,

First of all, if this is the wrong forum. Please feel free to delete/move post as necessary. We are looking to incorporate a new email marketing campaign to our company. We will be sending a short script to our customers and is looking for someone to critique our English. Feel free to change it anyway that will sounds professional. Thanks!

Hi "Name",

My name is "Owner's Name". I am the owner of "Company's Name". If you're thinking about replacing your old ancient and inefficient heating and air conditioning. I want to offer you a special deal before the summer or May 31, 2018. I am willing to cut my profit and offering you a HIGH-QUALITY TRANE Furnace for $500 INSTALLED if you buy an air conditioner for a regular price. Not only that, but I will give you a free Aprilaire High-Efficiency filter ($295 Value) and a WIFI thermostat ($195 Value) completely FREE. During the slow time like this, my company is struggling to keep our installers busy. Rather than losing my good installers to my competitor. I am willing to cut my profit and wait until the summer to make it up. We are fully licensed and insured with the state of Texas. If you want to know more details about this offer. Please feel free to reply back to this email or call me at (xxx) xxx-xxxx.