Fire Sprinklers are activated by smoke.
Fire sprinklers are only activated by heat. Smoke and/or smoke alarms will not activate a fire sprinkler.
All the fire sprinklers go off if one is activated.
Only the sprinkler head activated by the heat will discharge. The sprinkler nearest a fire will operate automatically while the fire is still small, controlling or extinguishing it. In 90% of structure fires, only one or two sprinkler heads activate, protecting surrounding rooms from fire, heat, smoke and water damage.
Damage from sprinkler water is worse than fire damage.
A home fire sprinkler uses about 1/10th the amount of water that fire hoses use. Home fire sprinklers control a fire while it is still small, limiting fire damage, smoke damage and water damage.
Fire sprinklers are ugly and will be an eyesore in the room.
Residential fire sprinklers are typically concealed in the ceiling or walls and not noticeable to homeowners.
There are maintenance requirements and annual fees for fire sprinkler systems.
Residential fire sprinklers require a minimum amount of sprinkler maintenance and no alarm monitoring. There is no costs to a home owner after the system is installed.
The installation of fire sprinklers adds significant time to the home’s construction.
Fire sprinklers are scheduled to coordinate with normal construction schedules to eliminate additional construction times. When scheduled prior to breaking ground there is NO additional time required for installation.
Fire sprinklers are expensive to the home builders and cost more money than they are worth.
According to most recent reports, incentives saved homebuilders approximately $1,949.00 per building lot and saved developers approximately $1,271.00 per lot and $10,752.00 per cul-de-sac.1

1 October 2010 "Incentives for Use of Residential Fire Sprinkler Systems in U.S. communities"