340 posts, read 414,887 times 1,135 posts, read 1,624,739 times 589 posts, read 882,928 times 1,345 posts, read 1,756,296 times 5,150 posts, read 5,049,224 times 8,406 posts, read 14,815,803 times Originally Posted by Glmore My home is 1600 sq. ft. , and I replaced the 3.5 ton AC unit and air handler a couple years ago for $2900. That is closer to the lower end than the higher end. The furnace was, and is, fine. Someone said 1 ton per 500 sq. ft., and I agree. I wanted supercooling ability, but was told if the unit cools the home too quickly, it doesn't remove enough humidity. I didn't understand that when I did the first system 12 years ago, but I learned.But in homes the size of yours and mine, zoning simply means closing a vent or two to redirect the air. The master suite is upstairs in my tri-level home, and I closed all the vents on the bottom floor to force more cool air into the master suite, It works well, since I don't use the downstairs bedrooms, They stay cooler anyway, year round.

Our homes aren't big enough to warrant a true zoned system. Originally Posted by Sean_CLT Good luck selling that house. You may not be able to have window units depending on your neighborhood rules. Window units are noisy, air leaks around them, bugs can get in, they are easily stolen and provide an easy entrance for would-be burglars, etc. They are a last resort IMHO. 104 posts, read 221,403 times Originally Posted by vmaxnc Some good info .....could you PM me the company you used for your AC replacement? 3,915 posts, read 2,674,064 times Having paid to replace several ACs myself in different homes, I will add the following. If you are comfortable in your home now, then there isn't any need to change how it works by adding zones, etc. If it is a builder grade system you are changing, you should however look at increasing the efficiency and reducing the noise while you have the opportunity to do so. Stick to a middle of the range unit.

That last % or so of efficiency isn't worth it. You should probably pay for a 2 speed system. They mostly operate at low speed but have the ability to shift higher during periods of a lot of heat or if you change the temp. Most contractors will include venting changes during the install. If you have a vent that is too little or too much, or a room that isn't heated or cooled properly, this is the time to tell them about it. Since you are doing a preemptive install, i.e. it's still working, I'd recommend waiting until they are in a slow period which would be the fall or spring. hvac unit 17There are better deals then.air conditioning units for townhouse Don't forget to check for rebates including those from the power company.low wattage ac unit

101 posts, read 141,257 times Originally Posted by Jareb Does this rule of thumb apply equally to one and two story homes? Does it apply in a linear fashion as square footage increases? I seem to be ok with two 2.5 ton units cooling a 3,600 square foot two-story house. 3.5 Ton 13 SEER Residential Sweat A/C System with 30 ft. Line Set Keep your home cool and comfortable with this 13 SEER sweat air conditioning system which is designed and approved for residential applications. A representative will be in contact to help determine the proper coil to be matched with the installation application. Final connections from line set to coil and condenser, and system start-up must be done by a certified technician. Approved for installation in the following States: CO, CT, ID, IL, IN, IA, KS, MA, ME, MI, MN, MO, MT, NE, NH, NJ, NY, ND, OH, OR, PA, RI, SD, UT, VT, WA, WV, WY. Keep your home cool and comfortable with this high quality and efficient 14 SEER central air conditioning system.

This system is ideal for new or replacement residential or commercial applications, and is designed to be used with a new or existing A/C ready furnace. The system consists of the outdoor condenser, indoor cased coil, thermal expansion valve, and 30 ft. line set. The fully cased micro-channel coil is filled with dry nitrogen, and a thermal expansion valve is included for field installation to increase cooling efficiency by properly metering the refrigerant. ComPac® I & ComPac® II wall mount air conditioners The ComPac I and ComPac II air conditioners are the world's foremost wall mount air conditioners for cooling telecommunications shelters and enclosures. Because of the constant heat load, cooling is required throughout the year. Both the ComPac I and ComPac II air conditioners have the necessary controls and safeties for operation in hot or cold weather. The primary difference in the two units is the factory installed economizer in the ComPacThe economizer cycle uses outside air, when cool and dry, to cool the

The economizer cycle can reduce run time on the compressor and the condenser fan motor by up to 75% thereby extending the compressor's and fan motor's life, reducing downtime and energy costs. Three model lines of ComPac wall mount air conditioners are built - the HVEA line, the AVPA line and the AVPC line. The HVEA line is our most efficient units with EER's (Energy Efficiency Ratio) up to 11.70 and feature an electronically commutated outdoor fan motor. The 3, 3.5, 4 & 5 ton HVEA models are available with a 2-stage compressor. cooling is approximately 65% of the total cooling capacity. The 2-stage compressor provides lower start-up amps which can be critical when operating with a generator. compressor also reduces energy costs and is able to more precisely match the cooling capacity of the air conditioner with the heat load in the shelter. The AVPA units are our most popular units and have EER's that range from 9.00 to 10.20. The ComPac I and ComPac II are built in cooling capacities of 1, 2, 2.5, 3, 3.5, 4, 5 and 6 tons and for

operation on a variety of power supplies. Units are tested to Underwriters Laboratories and CAN/CSA standards, listed by ETL, and rated for performance and efficiency according to the ANSI/Air Conditioning and Refrigeration Institute Efficiency Standard 390. Our newest line of air conditioners are the ASDCA/HSDCA models. These models feature a "full flow economizer", a 48 VDC indoor air mover and the CoolLinks controller. The full flow economizer provides the same quantity of outside air as the unit does in mechanical cooling. The 48 VDC air mover allows the shelter to be ventilated/cooled in the event of a loss ofThe CoolLinks controller sequences the operation of two air conditioners to ensure the most efficient conditioning of the space and the most balanced use of HVAC units. The CoolLinks controller has eight HVAC alarms andAn Ethernet connection is also provided for a SNMP interface through which the Network Operations Center can receive traps (alarms), monitor/change cooling and heating set points, and monitor HVAC unit and system

Marvair offers a variety of thermostat/controllers specifically designed to control two or more air conditioners in a telecommunications shelter. Go to our Telecom Controllers page for an overview of our various thermostats/controllers. Numerous options are available to meet special requirements. (Please see the Product Data Sheets for a complete listing and description of the options). Dehumidification Field or factory installed controls allow humidity to be maintained at or below a specified humidity set point. Dehumidification is achieved by operating mechanical cooling in conjunction with electric reheat. These units do not have the ability to add humidity to the building. Coastal Environmental Package - recommended for units installed near the ocean. External Low Noise Blower - used to reduce the sound of the unit in urban installations. Cabinet color and material. The units are available in several colors and can be constructed of aluminum or stainless steel.