When you’re shopping for new heating and air conditioning equipment, you may want to give a second thought to a heat pump. Heat pumps use electricity to heat a home, but they do not use nearly as much energy as conventional electric furnaces. Plus, a heat pump is primarily an air conditioner, so you get an all-in-one system that requires less maintenance and works more efficiently.

Want to know more? Our heating and AC technicians are here to answer all of your questions and make sure you end up with the right home comfort equipment for your home. For more information, contact our friendly technicians, and read on for a brief overview of the heat pump system.

A heat pump uses your central duct system to move heated or cooled air out to the various rooms of the home. It also has an outdoor compressor unit, just like a conventional whole-house air conditioning system. The indoor unit is joined to it by the refrigerant line.

Refrigerant is a chemical blend capable of moving heat from one place to another. When in cooling mode, refrigerant absorbs heat from the inside of the home and moves it outside. That’s how the cooling process is started.

A reversing valve works along with some other parts to give a heat pump the ability to switch into heating mode. The refrigerant can work in reverse and also absorb heat from the outdoors and move it inside for whole-home heating.

What makes a heat pump so efficient is that the process of moving heat from one place to another uses so much less energy than the process of generating heat (like furnaces and boilers do). When you examine other electric heaters, like portable units and electric furnaces, there is no comparison in the amount they are able to save each month.

Sometimes, a gas heating system is a better option. Efficiency does suffer as temperatures drop, and the cost of gas heating is typically lower than the cost of electricity. Ask a technician to help you decide what the best choice is for your home.

Last month, I wrote via www.bet.com

2) A Dwarf Makes Giant News

Astronomers are given the spotlight as they announce that Pluto, the dwarf planet with a changing orbit, has passed Neptune to become the ninth planet from the Sun. It had been the eighth farthest since 1979. Of course, we now know that Pluto is not a planet at all but some kind of ball of rock and ice. 

 4) Re-imagining Literary History

Tom Stoppard and Marc Norman win the Writers Guild Award for SHAKESPEARE IN LOVE. Also nominated were Robert Rodat for SAVING PRIVATE RYAN and Andrew Niccol for THE TRUMAN SHOW.

6) You’re Still the One

Shania Twain wins a Grammy for Best Female Country Vocal Performance for “You’re Still the One,” in which the Twain passionately announces, “We’re still together, still going strong.”

9) Run to the Hills

Gloriously, and to the headbanging delight of metal heads across the globe, Iron Maiden announces that singer Bruce Dickinson has rejoined the band. 

11) The Tumultuous Days Continue for Kid Dynamite

Early in the month, Mike Tyson is sentenced to four years in prison for assaulting two motorists after a traffic accident in 1998. The judge gives him only one year of jail time, followed by two years of probation and a $5000 fine. Days after he begins his sentence at the Montgomery County Detention Center, he is put in solitary confinement for throwing a TV in the general direction of some guards. He is released from solitary after about six days.

13) Return Mail

TLC releases their third album, FANMAIL, after a five year hiatus. The new album sells 318,000 copies in its first week, and it becomes clear to the world that TLC “don’t want no scrubs.”

15) The Dawning of the Age of the File Share

The Artist Formerly Known as Prince makes headlines a second time as he files a lawsuit against nine websites for copyright and trademark infringement. He accuses websites of selling bootlegged recordings and offering unauthorized song downloads.

There are several different types of medium voltage earthing systems. These systems can be differentiated by using the neutral point connection method. They are different in the way that they operate and each of them has its own pros and cons. These earthing systems in medium voltage include the likes of:

The functioning of each differs from the other. They also have various applications. Let’s have a look at each system at a time:

In this one, there is no electrical connection between the earth and the neutral point except for the devices that are used for measurement or protection. There is high impedance inserted between the earth and the neutral point. There is no switching on occurrence of the first insulation fault. It is therefore important to carry out permanent insulation monitoring, show the first insulation fault and locate and clear the first insulation fault.

Pros and cons: The advantage of using this one is that it provides services by tripping only when the second fault occurs which is subject to the capacity of the network not leading to a high earth fault current which would be dangerous for people when the first fault occurs. It has its demerits. There is the risk of high internal over-voltages. Insulation monitoring is also compulsory as well as the presence of maintenance personnel who will be monitoring and locating the first fault during use.

It is also known as direct earthing. It has a connection between the earth and the neutral point. Upon first insulation fault occurrence compulsory switching must be done. It is significantly different from the above mentioned unearthed neutral.

Pros and cons: This system reduces risk of over-voltage occurring and also authorizes the use of equipment with a normal phase to earth insulating level. On the other hand, there is mandatory tripping upon occurrence of the first fault. The touch voltages developed are very high and this poses a high risk for the personnel while the fault lasts. Differential protection devices must be used so that the clearance time of the fault is as short as possible.

This system requires a resistor to be inserted between the neutral point and the earth. It is also known as limiting resistance earthing. Their operating technique is quite straightforward. Switching must be done upon the occurrence of the first fault.

In the late sixties, and early seventies aluminum wiring began to be used because most available copper was going to the Vietnam war effort. However, aluminum wiring is not ideal for small home electrical systems.  The electrical devices at that time were not designed to handle the high temperature coefficients of aluminum wiring. Aluminum wires can also expand in diameter and length as they get hot, they can actually back out the screw terminals, causing a loose connection. This, in turn, can cause heat, which can ultimately lead to a fire.

After problems with aluminum wire termination became known—including one notable house fire—the UL (Underwriters Laboratories) and other agencies adopted new safety regulations and put more restrictive standards in place. However, many homes from the 60s and 70s still do not have safe aluminum wiring terminations. But there are a number of ways to solve this problem without having to rewire a home.

Consumer Safety Council Recommendations

According to the Consumer Safety Council, there are only two approved methods that splice aluminum wire to copper wire:

These standards have caused acceptance problems with home inspectors and insurance companies, which has led to homeowners paying 2 to 4  times as much as they should to have their aluminum wiring terminated.