Home warranty in the USA was founded in 1970s, when real estate market experienced a steady growth. During this period, newly emerged companies began to offer home service contracts that were called home warranties. Home warranty plans quickly gained popularity among homeowners. Today millions of home warranty plans are sold every year in the USA. These plans cover repairs of major home systems and appliances. Home systems include electrical, plumbing, heating and air conditioning. Home appliances that most home warranty companies insure include ovens, built-in microwaves, refrigerators, dishwashers, and such. The limitations of home warranty contracts include the number of the covered units, their size and location. Some companies limits dollar amount per home system, others have an overall limit per contract period, and once that limit is reached the company will no longer pay for any repairs or replacements.