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An electronic home security system can be the source of great peace of mind or great financial headache. That's because buying a system, and the alarm monitoring that often goes along with it, can be a thorny purchase, fraught with such perils as wildly differing prices, high-pressure sales tactics and unfriendly contracts.

Basic home security systems, or burglar alarms, are typically wired to a central control panel in the home that will activate when windows or doors are opened while the system is armed. More advanced systems add fire and carbon monoxide alarms, motion sensors, glass-break detectors and, increasingly, home automation options such as controlling home lighting and temperature.

The good news is that almost 80 percent of homeowners with alarms rated their systems as effective in protecting their homes, according to a survey by the Consumer Reports National Research Center.

But consumers shopping for systems often report hassles, said Angie Hicks, founder of Angie's List, which collects customer ratings for various categories.

"Home alarms is one of the categories where we hear complaints about high-pressure sale and scare tactics," she said. Some companies insist on long-term monitoring contracts.

And prices can be all over the place, said Robert Krughoff, president of Consumers' Checkbook, which rates home security companies and recently published an extensive report on the topic to its members.

"We see a lot of variation in price and no real relationship between quality and price," he said. "We found some of the lower-cost places rated very high in terms of quality, and some of the high-priced places don't rate particularly high."

Here are some basic questions and answers to help you shop.

. Do I need a home security system? "I think the most important advice is to think twice before even bothering with a system," Krughoff said. "There are a lot of things you can do that would probably be more powerful than any home security system."

Burglars usually aren't sophisticated. They often take advantage of unlocked doors or windows that are easily jarred open.

"Most of the time they get in through very unartful means," said Kevin Brasler, executive editor of Consumers' Checkbook.

Cheap and effective alternatives are quality deadbolts on doors, substantial window locks and motion-sensor lighting outside. You could get a dog, although its care might turn it into a pricey option. You could bluff by posting a Beware of Dog sign or the window stickers from alarm companies.

Habits matter too. Always lock you doors when you're away. And when you're on vacation, put lights on timers and have someone pick up newspapers or place newspapers on vacation hold.

The Consumer Reports survey found that 19 percent of respondents said they at least occasionally leave doors at home unlocked when they're out, and 26 percent said they at least occasionally leave windows unlocked when they're not at home.

Consider that owning an alarm can be a hassle. You have to turn it on when you leave and rush to turn it off when your arrive home.

. How do I choose an equipment installer? Get several price quotes for both system installation and monitoring, perhaps starting with companies rated highly by Consumers' Checkbook or Angie's List. Check for complaints against individual companies with the Better Business Bureau. Salespeople who try to intimidate or pressure you into a quick decision, sometimes pointing to recent spate of burglaries in the area, are ones to avoid, according to tips at Angieslist.com.

. Do I need monitoring? Central system monitoring can automatically notify an alarm company that there's a problem by sending a signal over a landline or wireless connection. They can, in turn, notify police or fire departments. Monitoring typically costs $20 to $50 a month, depending on what's included, but your alarm system will work without it. If your home is usually occupied or you have neighbors who will notify authorities that an alarm is sounding, central station monitoring provides only limited additional protection, according to the report in Consumers' Checkbook.

"You may not need the paid monitoring at all," Krughoff said.

And you don't have to stay with the same monitoring company. "People should realize that if they already have a system, they can switch very easily to another firm," Krughoff said.

It's worth shopping around. Prices for three years of monitoring ranged from about $900 to $1,800, Consumers' Checkbook found.

. Is there an insurance discount? Probably. Typically, homeowners can get a 5 percent discount on home insurance premiums for having a security system with monitoring. However, that won't nearly pay for the cost of monitoring. "It's not like a monitoring system will pay for itself like new insulation would," Brasler said.