Replacement Furnace and Air Conditioner?

Hey Bill, We are HVAC contractors in Texas, So, I am hoping I can help. One thing people are not being told about the Seer rating/ Efficiency rating is that the savings are very minute. It is highly unlikely that you will recoup the money invested with going to a higher SEER rating, so if that is a major factor in your decision, you should be prepared to stay in your house for 20 years or more. That leads us back to the brands that you noted Carrier, American Standard, and York. As far as I am concerned there are really only 3 real major brands; Carrier, Trane, and Lennox. York, in my humble opinion is junk. So that would rule them out. American Standard is Tranes cheaper version. I am not big fan of Carrier from a contractor standpoint, but some contractors really like them. I find them hard to work with. Working in the industry I will say that the older equipment that we come across most frequently is Lennox. I have seen some systems running for as long as 40 years with proper maintenance. It is not common, or even standard, but they are out there. Things to consider are this: How long are you going to be in the house. If you plan on moving in 3-5 years, go with the least expensive. If your in it for life, I would go with a strong brand name. You really need to compare apples to apples on this one. You need to know how many tons of air you need for your house. I am guessing by the price that this 4 tons? Have each vendor quote you a system that includes exactly what you need. no extras (UV Lights, Chimney liner.....) If you are already frustrated with the process and just want a direct answer, I would pick Option 2. Otherwise, I would go to each vendor and ask them for a comparative quote. Also, get a Lennox vendor in there! Do not be afraid of the off brand names like American Standard. It is a great way to get the Big Name quality with out paying the big name price! Hope this helps.

1. Aging data in the German tank problem

A reasonable approach may be to estimate the production rate by always using the maximum time period available. That is, create an estimate of $N$ every day, but use today's estimate along with the day 1 estimate and the number of days that have passed to get the estimated production rate. For $i ge 2,$ your day $i$ growth rate estimate $hatG$ will be $$hatG=hatN_i-hatN_1 over i-1$$The idea is similar to observing a stochastic process and estimating the rate as the number of observed events divided by the total time. Because your daily estimates $hatN_i$ are unbiased for the total number of tanks, the difference $hatN_i-hatN_1$ is unbiased for the number of tanks produced in that time period, and your overall production rate estimate $hatG$ will also be unbiased.It is true that you can get negative estimates in the early periods. So you will have to decide if you want to cap those at zero or use some other method to handle those cases. Note that your estimator is unbiased only if the sampling is without replacement. If your sampling is with replacement, you will need to consider another estimator

2. aib bags vs. lincoln air ride suspension which rides most comfortable?

Air ride suspension system on lincoln mark 8 consists of air bags , blower , sensors, etc... The air ride suspension is best in terms of smooth ride (merely my opinion) however the air bags wear and require replacement this is very costly and as a result most recommend converting air ride suspension over to shocks and struts. has a wide variety of info on lincolns

3. How do I increase our water pressure?

Either have your pump's output checked or do it yourself. It sounds like you either have a plugged line somewhere (either input or output) or the pump needs replacement

4. heavy metal toxicity and heavy metal exposure testing: what you should know

While the body needs a small number of heavy metals (zinc, manganese, copper, iron, chromium), buildups of certain metals can be harmful. Such accumulation is known as "heavy metal poisoning" and can be toxic to the body. Here we explore who is vulnerable to heavy metal toxicity and what is involved with heavy metal exposure testing. Heavy metals are naturally occurring elements found on the earth and used in modern-day applications, including medicine, agriculture, and manufacturing. They include lead, arsenic, mercury, cadmium, and cobalt. Humans can be exposed to high concentrations of these metals from air or water pollution, medicine, food, and industrial processes, to mention a few. An accumulation of some heavy metals is toxic, because the metals react with the human body's systems, causing health problems that can range from nervous system dysfunction to gastrointestinal problems. High amounts of arsenic, for example, inhibit the function of a variety of enzymes. Arsenic poisoning can manifest in the form of a brain hemorrhage, muscle aches, seizures, hardening of the skin, bloody diarrhea, and vomiting. Other metals, such as lead, mimic the molecular composition of calcium, causing enzymes and protein channels that use the nutrient to malfunction as the metal accumulates in the body. High amounts of lead in the body cause various neurological problems, including seizures, confusion, and headaches. Lead is particularly harmful to young children whose brains are still developing. Occupational exposure accounts for a vast majority of heavy metal poisonings. For example, people working in the electronics and manufacturing industries are more likely to experience heavy metal poisoning because they are regularly exposed to heavy metals in the workplace. Workers in the battery manufacturing industry, for example, are regularly exposed to cadmium. Lead can be found in many industries and products. This metal negatively affects children that are exposed to it via paint, especially older paint found in old school buildings and houses. The kids may ingest or chew the paint chips, leading to heavy metal poisoning. In the United States, lead poisoning usually affects kids aged 1-3 years. Cobalt toxicity can occur after hip replacement surgery in patients that receive a transplanted prosthetic containing this metal. While cobalt poisoning is a rare occurrence, studies show that medical devices, as in the case of a hip replacement device that contains cobalt, can lead to heavy metal poisoning. Three case studies were performed in 2014 within 10 days of each other to examine the impact of cobalt toxicity after hip replacement surgery. The patients examined during the study exhibited similar symptoms. Their blood samples revealed high serum cobalt levels. Previous studies showed cobalt toxicity resulted from metal-on-metal implants only, but subsequent research indicated that metal-on-polyethylene implants also can cause heavy metal poisoning. The researchers found that once the metal in the device wears down, the cobalt is released into the bloodstream, causing toxicity. Patients exhibited symptoms, such as: None Nerve damage in the hands and face The findings prompted the US Food and Drug Administration to recommend follow-ups on asymptomatic hip-replacement patients by performing routine radiographs and physical examinations. How a Heavy Metal Toxicity Blood Test Can Help A heavy metal toxicity blood test can reveal heavy metal poisoning. The test determines the level of potentially harmful metals (arsenic, lead, mercury, and cadmium) in the blood. Screening for heavy metal toxicity may also include gathering occupational, dietary, and recreational histories to identify the source of exposure. How the Heavy Metal Toxicity Test is Performed The emergence of less invasive specimen collection methods like volumetric absorptive microsampling (VAMS) with a Mitra device makes it easier to collect samples for heavy metal blood testing. VAMS technology works with portable Mitra devices that use a simple finger-stick technique, allowing for easy specimen collection at the workplace or remote specimen collection at home. With remote collection, the individual uses a remote health kit like the Mitra Blood Collection Kit to collect their own sample at home. The samples are mailed to the lab for analysis, and the healthcare team can follow up to provide test results. Some health and wellness companies are also selling home health kits for heavy metal testing that people can purchase independently to get screened for heavy metal exposure on their own. VAMS has proved to be a reliable method for research studies of heavy metal toxicity, as was shown in a study to determine cobalt toxicity in metal-on-metal prosthesis patients. The sample collection method and extraction procedure provided accurate results independent of the age of the VAMS samples. Due to the ease and simplicity of using remote, portable specimen collection options for studies in heavy metal testing, future screenings of employees in high-risk work settings or vulnerable patient populations also may leverage kits that include Mitra with VAMS technology.

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