killbot5000

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I’m trying to grasp the intuition of complex numbers. “i” is defined as the square root of negative one… but is a more useful way to think of it is a number that, when squared, is -1? It seems like that’s where the magic of its utility happens.

Been looking around for my wife, who has a serious but undiagnosed issue. Specialists just punt her around. All new patient appointments for PCPs are 6+ months out.

Does anyone have any private practice recommendations?

I’m considering installing some hydronic heating in my house. I’d prefer to use it with a heat pump to save on energy. I know such systems are common in Europe, but are there any available setups in the US?

I’ve got some drafts coming from behind the drywall of several places in my house. My first thought is that the walls are not sealed at the top so cold air is entering via the eaves and flowing down inside my wall cavity and out via outlet holes etc. I’m considering having a company come poke their head inside my eaves and seal them up if they’re open. Is that wise? Is airflow there important for dealing with moisture or any other reason?

My wife has severe light sensitivity. Our light fixtures all have exposed bulbs and even very dim bulbs are too bright.

Are there any recommendations for ceiling mounted fixtures that block all direct light? Ideally just illuminating the ceiling for mostly indirect light?

Any other lighting suggestions?

I’m considering upgrading my single stage 1.5 ton heat pump to an 2ton inverter heat pump .

I thought it would be possible to upgrade only my condenser unit, and leave my single stage air handler.

What would the implications of that be? Is an inverter heat pump with a single speed fan a terrible idea?

My understanding is that an inverter is “continuously variable” speed. That implies the temperature of the refrigerant varies depending on some control input, but I don’t know what it is. Is my understanding correct?

I’ve seen the video showing how to access engineering mode on an Ioniq 5, but it doesn’t work for me. The Ioniq in the video is running European firmware, though.

Has anyone gained access to engineering mode on a US Ioniq?

I’m considering upgrading my 1.5 ton Rheem RP14 heat pump to an RP20 inverter based heat pump.

I’ve been comparing the specifications of the different models on the spec sheets.

Supposedly the COP of my existing 1.5 ton RP14 model is higher at both 47 and 17 degrees test, but it’s HSPF is 8 (compared to the RP20s 11ish).

How can the coefficient of perormance be worse at both temperature and yet have a higher HSPF rating? I though HSPF was derived from COP measurements?

I sold my car to a dealership today.

They had examined it and made an offer, citing (obvious) damage for the low offer.

I later accepted the offer (slightly higher than a competing offer). I signed the titling forms, the bill of sale, and gave them possession of the title, vehicle, and keys.

They called me up a few hour later saying they wouldn’t honor the price because of damages. The sales manager (who signed my bill of sale) is telling me we need to “rework the numbers”.

What is my recourse here? I’m tempted to take the car to the other buyer and sue them in small claims court for the difference in price.

I just sold my car to a dealer.

They examined it and quoted me a price.

I agreed to the price. I drove the vehicle to them, signed a bunch of title paper work, and have a signed purchase order from them.

They called me up and told me they need to “rework the numbers” and won’t pay me the price we agreed to after taking custody of my title and vehicle.

What can I do here? I have a copy of the signed purchase order.

We have a chest freezer. The temptation to use it as extra shelf space is always strong, resulting in It being inconvenient to access the freezer.

Has anyone come up with some clever solution for this problem?

I’ve read that programmable thermostats with heat pumps in winter is less efficient than holding a constant temp. The reasoning is always because of aux electric heaters kicking in, which makes sense.

Does this hold true if the aux heat is disabled and only heat pump mode is used?

I’m trying to reduce power consumption of a 1.5 Ton 14SEER Rheem single stage heat pump for my second floor. I’ve programmed my thermostat to engage emergency heat only under extreme circumstances and disconnected the “defrost” signal from enabling backup heat as well. I’m wondering now if it’s better to keep it pinned to 68F 24x7 or turn it down at night. Heat pump isn’t having any trouble keeping up as far as I